51390800 has 30 divisors (see below), whose sum is σ = 123467358. Its totient is φ = 20556160.

The previous prime is 51390793. The next prime is 51390811. The reversal of 51390800 is 809315.

It can be written as a sum of positive squares in 3 ways, for example, as 2334784 + 49056016 = 1528^2 + 7004^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51390800.

It is a congruent number.

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, 63839 + ... + 64638.

Almost surely, 2^51390800 is an apocalyptic number.

51390800 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51390800 is an abundant number, since it is smaller than the sum of its proper divisors (72076558).

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

51390800 is a wasteful number, since it uses less digits than its factorization.

51390800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128495 (or 128484 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 51390800 is about 7168.7376852553. The cubic root of 51390800 is about 371.7877927939.

The spelling of 51390800 in words is "fifty-one million, three hundred ninety thousand, eight hundred".