51851408 has 30 divisors (see below), whose sum is σ = 116865846. Its totient is φ = 22221696.

The previous prime is 51851381. The next prime is 51851417. The reversal of 51851408 is 80415815.

It can be written as a sum of positive squares in only one way, i.e., 49392784 + 2458624 = 7028^2 + 1568^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32285 + ... + 33852.

Almost surely, 2^51851408 is an apocalyptic number.

It is an amenable number.

51851408 is an abundant number, since it is smaller than the sum of its proper divisors (65014438).

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

51851408 is a wasteful number, since it uses less digits than its factorization.

51851408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66159 (or 66146 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 32.

The square root of 51851408 is about 7200.7921786426. The cubic root of 51851408 is about 372.8952500266.

The spelling of 51851408 in words is "fifty-one million, eight hundred fifty-one thousand, four hundred eight".