51985700 has 36 divisors (see below), whose sum is σ = 121489620. Its totient is φ = 19194240.

The previous prime is 51985693. The next prime is 51985721. The reversal of 51985700 is 758915.

It can be written as a sum of positive squares in 6 ways, for example, as 13147876 + 38837824 = 3626^2 + 6232^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18695 + ... + 21294.

Almost surely, 2^51985700 is an apocalyptic number.

51985700 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51985700 is an abundant number, since it is smaller than the sum of its proper divisors (69503920).

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

51985700 is a wasteful number, since it uses less digits than its factorization.

51985700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40016 (or 40009 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 35.

The square root of 51985700 is about 7210.1109561504. The cubic root of 51985700 is about 373.2168978593.

The spelling of 51985700 in words is "fifty-one million, nine hundred eighty-five thousand, seven hundred".