28661504 has 18 divisors (see below), whose sum is σ = 57211560. Its totient is φ = 14330624.

The previous prime is 28661489. The next prime is 28661527. The reversal of 28661504 is 40516682.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55724 + ... + 56235.

It is an arithmetic number, because the mean of its divisors is an integer number (3178420).

Almost surely, 2^28661504 is an apocalyptic number.

It is an amenable number.

28661504 is a deficient number, since it is larger than the sum of its proper divisors (28550056).

28661504 is an equidigital number, since it uses as much as digits as its factorization.

28661504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111975 (or 111961 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 28661504 is about 5353.6439926465. The cubic root of 28661504 is about 306.0316369813.

The spelling of 28661504 in words is "twenty-eight million, six hundred sixty-one thousand, five hundred four".