52566990 has 64 divisors (see below), whose sum is σ = 146935296. Its totient is φ = 11786112.

The previous prime is 52566953. The next prime is 52566991. The reversal of 52566990 is 9966525.

52566990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52566991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8769 + ... + 13491.

It is an arithmetic number, because the mean of its divisors is an integer number (2295864).

Almost surely, 2^52566990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 52566990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73467648).

52566990 is an abundant number, since it is smaller than the sum of its proper divisors (94368306).

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

52566990 is a wasteful number, since it uses less digits than its factorization.

52566990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4793.

The product of its (nonzero) digits is 145800, while the sum is 42.

The square root of 52566990 is about 7250.3096485598. The cubic root of 52566990 is about 374.6028150217.

It can be divided in two parts, 5256 and 6990, that added together give a triangular number (12246 = T₁₅₆).

The spelling of 52566990 in words is "fifty-two million, five hundred sixty-six thousand, nine hundred ninety".