51405056 has 36 divisors (see below), whose sum is σ = 103575612. Its totient is φ = 25460736.

The previous prime is 51405049. The next prime is 51405073. The reversal of 51405056 is 65050415.

It can be written as a sum of positive squares in 2 ways, for example, as 10240000 + 41165056 = 3200^2 + 6416^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28040 + ... + 29816.

Almost surely, 2^51405056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51405056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51787806).

51405056 is an abundant number, since it is smaller than the sum of its proper divisors (52170556).

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

51405056 is a wasteful number, since it uses less digits than its factorization.

51405056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1906 (or 1892 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 51405056 is about 7169.7319336221. The cubic root of 51405056 is about 371.8221680566.

The spelling of 51405056 in words is "fifty-one million, four hundred five thousand, fifty-six".