52991628 has 12 divisors (see below), whose sum is σ = 123647160. Its totient is φ = 17663872.

The previous prime is 52991623. The next prime is 52991629. The reversal of 52991628 is 82619925.

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

It is a super-2 number, since 2×52991628² = 5616225276180768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 52991628.

It is not an unprimeable number, because it can be changed into a prime (52991623) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2207973 + ... + 2207996.

It is an arithmetic number, because the mean of its divisors is an integer number (10303930).

Almost surely, 2^52991628 is an apocalyptic number.

It is an amenable number.

52991628 is an abundant number, since it is smaller than the sum of its proper divisors (70655532).

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

52991628 is a wasteful number, since it uses less digits than its factorization.

52991628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4415976 (or 4415974 counting only the distinct ones).

The product of its digits is 77760, while the sum is 42.

The square root of 52991628 is about 7279.5348752513. The cubic root of 52991628 is about 375.6087960005.

The spelling of 52991628 in words is "fifty-two million, nine hundred ninety-one thousand, six hundred twenty-eight".