39645564 has 48 divisors (see below), whose sum is σ = 111944448. Its totient is φ = 10660608.

The previous prime is 39645521. The next prime is 39645569. The reversal of 39645564 is 46554693.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39645569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12454 + ... + 15309.

It is an arithmetic number, because the mean of its divisors is an integer number (2332176).

Almost surely, 2^39645564 is an apocalyptic number.

39645564 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

39645564 is an abundant number, since it is smaller than the sum of its proper divisors (72298884).

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

39645564 is a wasteful number, since it uses less digits than its factorization.

39645564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27794 (or 27792 counting only the distinct ones).

The product of its digits is 388800, while the sum is 42.

The square root of 39645564 is about 6296.4723456869. The cubic root of 39645564 is about 340.9820626209.

The spelling of 39645564 in words is "thirty-nine million, six hundred forty-five thousand, five hundred sixty-four".