52021660 has 12 divisors (see below), whose sum is σ = 109245528. Its totient is φ = 20808656.

The previous prime is 52021643. The next prime is 52021687. The reversal of 52021660 is 6612025.

52021660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1300522 + ... + 1300561.

It is an arithmetic number, because the mean of its divisors is an integer number (9103794).

Almost surely, 2^52021660 is an apocalyptic number.

It is an amenable number.

52021660 is an abundant number, since it is smaller than the sum of its proper divisors (57223868).

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

52021660 is a wasteful number, since it uses less digits than its factorization.

52021660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2601092 (or 2601090 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 52021660 is about 7212.6042453472. The cubic root of 52021660 is about 373.3029329696.

Adding to 52021660 its reverse (6612025), we get a palindrome (58633685).

The spelling of 52021660 in words is "fifty-two million, twenty-one thousand, six hundred sixty".