52686621 has 24 divisors (see below), whose sum is σ = 86781240. Its totient is φ = 30514176.

The previous prime is 52686619. The next prime is 52686637. The reversal of 52686621 is 12668625.

52686621 = 1411² + 1412² + ... + 1436².

52686621 is a `hidden beast` number, since 5 + 26 + 8 + 6 + 621 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2134521 + 50552100 = 1461^2 + 7110^2 .

It is not a de Polignac number, because 52686621 - 2¹ = 52686619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52686661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11256 + ... + 15233.

It is an arithmetic number, because the mean of its divisors is an integer number (3615885).

Almost surely, 2^52686621 is an apocalyptic number.

52686621 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

52686621 is a deficient number, since it is larger than the sum of its proper divisors (34094619).

52686621 is a wasteful number, since it uses less digits than its factorization.

52686621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26525 (or 26522 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 52686621 is about 7258.5550214902. Note that the first 3 decimals coincide. The cubic root of 52686621 is about 374.8867711480.

The spelling of 52686621 in words is "fifty-two million, six hundred eighty-six thousand, six hundred twenty-one".