51011856 has 100 divisors (see below), whose sum is σ = 168764992. Its totient is φ = 14572224.

The previous prime is 51011839. The next prime is 51011869. The reversal of 51011856 is 65811015.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6261 + ... + 11883.

Almost surely, 2^51011856 is an apocalyptic number.

51011856 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51011856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84382496).

51011856 is an abundant number, since it is smaller than the sum of its proper divisors (117753136).

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

51011856 is a wasteful number, since it uses less digits than its factorization.

51011856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5650 (or 5635 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

The square root of 51011856 is about 7142.2584663396. The cubic root of 51011856 is about 370.8717113951.

The spelling of 51011856 in words is "fifty-one million, eleven thousand, eight hundred fifty-six".