51365808 has 120 divisors (see below), whose sum is σ = 161677152. Its totient is φ = 15105024.

The previous prime is 51365807. The next prime is 51365827. The reversal of 51365808 is 80856315.

51365808 is a `hidden beast` number, since 513 + 65 + 80 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (51365803) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42460 + ... + 43652.

Almost surely, 2^51365808 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 51365808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80838576).

51365808 is an abundant number, since it is smaller than the sum of its proper divisors (110311344).

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

51365808 is a wasteful number, since it uses less digits than its factorization.

51365808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243 (or 1234 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 51365808 is about 7166.9943490978. The cubic root of 51365808 is about 371.7275146432.

The spelling of 51365808 in words is "fifty-one million, three hundred sixty-five thousand, eight hundred eight".