51287502 has 16 divisors (see below), whose sum is σ = 117228672. Its totient is φ = 14653560.

The previous prime is 51287501. The next prime is 51287503. The reversal of 51287502 is 20578215.

It is an interprime number because it is at equal distance from previous prime (51287501) and next prime (51287503).

It is a super-2 number, since 2×51287502² = 5260815722800008, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51287502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51287501) 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, 610524 + ... + 610607.

It is an arithmetic number, because the mean of its divisors is an integer number (7326792).

Almost surely, 2^51287502 is an apocalyptic number.

51287502 is an abundant number, since it is smaller than the sum of its proper divisors (65941170).

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

51287502 is a wasteful number, since it uses less digits than its factorization.

51287502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221143.

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 51287502 is about 7161.5293059513. The cubic root of 51287502 is about 371.5385218730.

The spelling of 51287502 in words is "fifty-one million, two hundred eighty-seven thousand, five hundred two".