51907820 has 24 divisors (see below), whose sum is σ = 109242000. Its totient is φ = 20718272.

The previous prime is 51907759. The next prime is 51907841. The reversal of 51907820 is 2870915.

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, 7631 + ... + 12729.

It is an arithmetic number, because the mean of its divisors is an integer number (4551750).

Almost surely, 2^51907820 is an apocalyptic number.

It is an amenable number.

51907820 is an abundant number, since it is smaller than the sum of its proper divisors (57334180).

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

51907820 is a wasteful number, since it uses less digits than its factorization.

51907820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5617 (or 5615 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 51907820 is about 7204.7081828482. The cubic root of 51907820 is about 373.0304321017.

The spelling of 51907820 in words is "fifty-one million, nine hundred seven thousand, eight hundred twenty".