51640080 has 80 divisors (see below), whose sum is σ = 161715840. Its totient is φ = 13630464.

The previous prime is 51640063. The next prime is 51640087. The reversal of 51640080 is 8004615.

51640080 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 51640080.

It is not an unprimeable number, because it can be changed into a prime (51640087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23676 + ... + 25764.

It is an arithmetic number, because the mean of its divisors is an integer number (2021448).

Almost surely, 2^51640080 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51640080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80857920).

51640080 is an abundant number, since it is smaller than the sum of its proper divisors (110075760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51640080 is a wasteful number, since it uses less digits than its factorization.

51640080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2208 (or 2202 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 51640080 is about 7186.1032555899. The cubic root of 51640080 is about 372.3879638441.

Adding to 51640080 its reverse (8004615), we get a palindrome (59644695).

The spelling of 51640080 in words is "fifty-one million, six hundred forty thousand, eighty".