39666628 has 24 divisors (see below), whose sum is σ = 72696960. Its totient is φ = 18902400.

The previous prime is 39666587. The next prime is 39666629. The reversal of 39666628 is 82666693.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is not an unprimeable number, because it can be changed into a prime (39666629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32428 + ... + 33628.

It is an arithmetic number, because the mean of its divisors is an integer number (3029040).

Almost surely, 2^39666628 is an apocalyptic number.

39666628 is the 3367-th centered heptagonal number.

It is an amenable number.

39666628 is a deficient number, since it is larger than the sum of its proper divisors (33030332).

39666628 is a wasteful number, since it uses less digits than its factorization.

39666628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1587 (or 1585 counting only the distinct ones).

The product of its digits is 559872, while the sum is 46.

The square root of 39666628 is about 6298.1448062108. The cubic root of 39666628 is about 341.0424407463.

The spelling of 39666628 in words is "thirty-nine million, six hundred sixty-six thousand, six hundred twenty-eight".