39664275 has 72 divisors (see below), whose sum is σ = 78369984. Its totient is φ = 17640000.

The previous prime is 39664271. The next prime is 39664277. The reversal of 39664275 is 57246693.

It is not a de Polignac number, because 39664275 - 2² = 39664271 is a prime.

It is a super-2 number, since 2×39664275² = 3146509422551250, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (39664271) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 157900 + ... + 158150.

It is an arithmetic number, because the mean of its divisors is an integer number (1088472).

Almost surely, 2^39664275 is an apocalyptic number.

39664275 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

39664275 is a deficient number, since it is larger than the sum of its proper divisors (38705709).

39664275 is a wasteful number, since it uses less digits than its factorization.

39664275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 309 counting only the distinct ones).

The product of its digits is 272160, while the sum is 42.

The square root of 39664275 is about 6297.9580024005. The cubic root of 39664275 is about 341.0356971370.

The spelling of 39664275 in words is "thirty-nine million, six hundred sixty-four thousand, two hundred seventy-five".