51402864 has 40 divisors (see below), whose sum is σ = 134669952. Its totient is φ = 16891840.

The previous prime is 51402863. The next prime is 51402881. The reversal of 51402864 is 46820415.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51402863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4134 + ... + 10949.

Almost surely, 2^51402864 is an apocalyptic number.

It is an amenable number.

51402864 is an abundant number, since it is smaller than the sum of its proper divisors (83267088).

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

51402864 is a wasteful number, since it uses less digits than its factorization.

51402864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15165 (or 15159 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 51402864 is about 7169.5790671419. The cubic root of 51402864 is about 371.8168829359.

The spelling of 51402864 in words is "fifty-one million, four hundred two thousand, eight hundred sixty-four".