51403687420 has 24 divisors (see below), whose sum is σ = 108204169248. Its totient is φ = 20512632000.

The previous prime is 51403687417. The next prime is 51403687471. The reversal of 51403687420 is 2478630415.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3044056 + ... + 3060895.

It is an arithmetic number, because the mean of its divisors is an integer number (4508507052).

Almost surely, 2^51403687420 is an apocalyptic number.

It is an amenable number.

51403687420 is an abundant number, since it is smaller than the sum of its proper divisors (56800481828).

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

51403687420 is a wasteful number, since it uses less digits than its factorization.

51403687420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6105381 (or 6105379 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 51403687420 in words is "fifty-one billion, four hundred three million, six hundred eighty-seven thousand, four hundred twenty".