51020080 has 20 divisors (see below), whose sum is σ = 118621872. Its totient is φ = 20408000.

The previous prime is 51020069. The next prime is 51020083. The reversal of 51020080 is 8002015.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (51020083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318796 + ... + 318955.

Almost surely, 2^51020080 is an apocalyptic number.

It is an amenable number.

51020080 is an abundant number, since it is smaller than the sum of its proper divisors (67601792).

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

51020080 is a wasteful number, since it uses less digits than its factorization.

51020080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637764 (or 637758 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 51020080 is about 7142.8341713916. The cubic root of 51020080 is about 370.8916406514.

Adding to 51020080 its reverse (8002015), we get a palindrome (59022095).

The spelling of 51020080 in words is "fifty-one million, twenty thousand, eighty".