52623721 has 6 divisors (see below), whose sum is σ = 55901630. Its totient is φ = 49527936.

The previous prime is 52623677. The next prime is 52623757. The reversal of 52623721 is 12732625.

It can be written as a sum of positive squares in 3 ways, for example, as 26214400 + 26409321 = 5120^2 + 5139^2 .

It is not a de Polignac number, because 52623721 - 2⁹ = 52623209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 52623721.

It is not an unprimeable number, because it can be changed into a prime (52653721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 90756 + ... + 91333.

Almost surely, 2^52623721 is an apocalyptic number.

It is an amenable number.

52623721 is a deficient number, since it is larger than the sum of its proper divisors (3277909).

52623721 is a wasteful number, since it uses less digits than its factorization.

52623721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182123 (or 182106 counting only the distinct ones).

The product of its digits is 5040, while the sum is 28.

The square root of 52623721 is about 7254.2209092362. The cubic root of 52623721 is about 374.7375253654.

The spelling of 52623721 in words is "fifty-two million, six hundred twenty-three thousand, seven hundred twenty-one".