38664945 has 72 divisors (see below), whose sum is σ = 76684608. Its totient is φ = 18675360.

The previous prime is 38664937. The next prime is 38664949. The reversal of 38664945 is 54946683.

It is not a de Polignac number, because 38664945 - 2³ = 38664937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 38664945.

It is not an unprimeable number, because it can be changed into a prime (38664949) 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, 146884 + ... + 147146.

It is an arithmetic number, because the mean of its divisors is an integer number (1065064).

Almost surely, 2^38664945 is an apocalyptic number.

It is an amenable number.

38664945 is a deficient number, since it is larger than the sum of its proper divisors (38019663).

38664945 is a wasteful number, since it uses less digits than its factorization.

38664945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305 (or 282 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 38664945 is about 6218.1142639871. The cubic root of 38664945 is about 338.1472025514.

The spelling of 38664945 in words is "thirty-eight million, six hundred sixty-four thousand, nine hundred forty-five".