51988890 has 32 divisors (see below), whose sum is σ = 132114240. Its totient is φ = 13048064.

The previous prime is 51988889. The next prime is 51988913. The reversal of 51988890 is 9888915.

It is a Curzon number.

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, 50460 + ... + 51479.

It is an arithmetic number, because the mean of its divisors is an integer number (4128570).

Almost surely, 2^51988890 is an apocalyptic number.

51988890 is an abundant number, since it is smaller than the sum of its proper divisors (80125350).

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

51988890 is a wasteful number, since it uses less digits than its factorization.

51988890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101966.

The product of its (nonzero) digits is 207360, while the sum is 48.

The square root of 51988890 is about 7210.3321698796. The cubic root of 51988890 is about 373.2245316096.

The spelling of 51988890 in words is "fifty-one million, nine hundred eighty-eight thousand, eight hundred ninety".