51102856 has 32 divisors (see below), whose sum is σ = 115272000. Its totient is φ = 20748096.

The previous prime is 51102841. The next prime is 51102859. The reversal of 51102856 is 65820115.

51102856 = 249² + 250² + ... + 552².

It is a super-2 number, since 2×51102856² = 5223003782713472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (51102859) 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, 22951 + ... + 25078.

It is an arithmetic number, because the mean of its divisors is an integer number (3602250).

Almost surely, 2^51102856 is an apocalyptic number.

51102856 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51102856 is an abundant number, since it is smaller than the sum of its proper divisors (64169144).

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

51102856 is a wasteful number, since it uses less digits than its factorization.

51102856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48061 (or 48057 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 51102856 is about 7148.6261617181. The cubic root of 51102856 is about 371.0921129500.

The spelling of 51102856 in words is "fifty-one million, one hundred two thousand, eight hundred fifty-six".