51207808 has 64 divisors (see below), whose sum is σ = 109554120. Its totient is φ = 23756800.

The previous prime is 51207799. The next prime is 51207817. The reversal of 51207808 is 80870215.

It is an interprime number because it is at equal distance from previous prime (51207799) and next prime (51207817).

It can be written as a sum of positive squares in 4 ways, for example, as 50580544 + 627264 = 7112^2 + 792^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 51207808.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219660 + ... + 219892.

Almost surely, 2^51207808 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 51207808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54777060).

51207808 is an abundant number, since it is smaller than the sum of its proper divisors (58346312).

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

51207808 is a wasteful number, since it uses less digits than its factorization.

51207808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365 (or 353 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 51207808 is about 7155.9631077864. The cubic root of 51207808 is about 371.3459815242.

The spelling of 51207808 in words is "fifty-one million, two hundred seven thousand, eight hundred eight".