51990252 has 12 divisors (see below), whose sum is σ = 121310616. Its totient is φ = 17330080.

The previous prime is 51990241. The next prime is 51990277. The reversal of 51990252 is 25209915.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2166249 + ... + 2166272.

It is an arithmetic number, because the mean of its divisors is an integer number (10109218).

Almost surely, 2^51990252 is an apocalyptic number.

It is an amenable number.

51990252 is an abundant number, since it is smaller than the sum of its proper divisors (69320364).

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

51990252 is a wasteful number, since it uses less digits than its factorization.

51990252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4332528 (or 4332526 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 51990252 is about 7210.4266170595. The cubic root of 51990252 is about 373.2277908147.

The spelling of 51990252 in words is "fifty-one million, nine hundred ninety thousand, two hundred fifty-two".