51287656 has 16 divisors (see below), whose sum is σ = 109902240. Its totient is φ = 21980400.

The previous prime is 51287653. The next prime is 51287659. The reversal of 51287656 is 65678215.

It is an interprime number because it is at equal distance from previous prime (51287653) and next prime (51287659).

It is not an unprimeable number, because it can be changed into a prime (51287653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457870 + ... + 457981.

It is an arithmetic number, because the mean of its divisors is an integer number (6868890).

Almost surely, 2^51287656 is an apocalyptic number.

51287656 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51287656 is an abundant number, since it is smaller than the sum of its proper divisors (58614584).

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

51287656 is a wasteful number, since it uses less digits than its factorization.

51287656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 915864 (or 915860 counting only the distinct ones).

The product of its digits is 100800, while the sum is 40.

The square root of 51287656 is about 7161.5400578367. The cubic root of 51287656 is about 371.5388937432.

The spelling of 51287656 in words is "fifty-one million, two hundred eighty-seven thousand, six hundred fifty-six".