28661572 has 12 divisors (see below), whose sum is σ = 50411200. Its totient is φ = 14258376.

The previous prime is 28661561. The next prime is 28661579. The reversal of 28661572 is 27516682.

It is a happy number.

It is a super-2 number, since 2×28661572² = 1642971419022368, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28661579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17208 + ... + 18799.

Almost surely, 2^28661572 is an apocalyptic number.

It is an amenable number.

28661572 is a deficient number, since it is larger than the sum of its proper divisors (21749628).

28661572 is a wasteful number, since it uses less digits than its factorization.

28661572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36210 (or 36208 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 28661572 is about 5353.6503434573. The cubic root of 28661572 is about 306.0318790032.

The spelling of 28661572 in words is "twenty-eight million, six hundred sixty-one thousand, five hundred seventy-two".