51979890 has 32 divisors (see below), whose sum is σ = 129055680. Its totient is φ = 13383104.

The previous prime is 51979849. The next prime is 51979903. The reversal of 51979890 is 9897915.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29004 + ... + 30743.

It is an arithmetic number, because the mean of its divisors is an integer number (4032990).

Almost surely, 2^51979890 is an apocalyptic number.

51979890 is an abundant number, since it is smaller than the sum of its proper divisors (77075790).

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

51979890 is a wasteful number, since it uses less digits than its factorization.

51979890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59786.

The product of its (nonzero) digits is 204120, while the sum is 48.

The square root of 51979890 is about 7209.7080384715. The cubic root of 51979890 is about 373.2029935807.

The spelling of 51979890 in words is "fifty-one million, nine hundred seventy-nine thousand, eight hundred ninety".