51615828 has 36 divisors (see below), whose sum is σ = 142335648. Its totient is φ = 15641040.

The previous prime is 51615827. The next prime is 51615833. The reversal of 51615828 is 82851615.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 51615792 and 51615801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51615827) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 64776 + ... + 65567.

It is an arithmetic number, because the mean of its divisors is an integer number (3953768).

Almost surely, 2^51615828 is an apocalyptic number.

It is an amenable number.

51615828 is an abundant number, since it is smaller than the sum of its proper divisors (90719820).

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

51615828 is a wasteful number, since it uses less digits than its factorization.

51615828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130364 (or 130359 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 51615828 is about 7184.4156338564. The cubic root of 51615828 is about 372.3296592155.

The spelling of 51615828 in words is "fifty-one million, six hundred fifteen thousand, eight hundred twenty-eight".