51325040 has 80 divisors (see below), whose sum is σ = 136116288. Its totient is φ = 17829888.

The previous prime is 51325019. The next prime is 51325063. The reversal of 51325040 is 4052315.

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 (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16229 + ... + 19131.

Almost surely, 2^51325040 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 51325040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68058144).

51325040 is an abundant number, since it is smaller than the sum of its proper divisors (84791248).

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

51325040 is a wasteful number, since it uses less digits than its factorization.

51325040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2946 (or 2940 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 51325040 is about 7164.1496355115. The cubic root of 51325040 is about 371.6291444175.

Adding to 51325040 its reverse (4052315), we get a palindrome (55377355).

The spelling of 51325040 in words is "fifty-one million, three hundred twenty-five thousand, forty".