28941904 has 10 divisors (see below), whose sum is σ = 56074970. Its totient is φ = 14470944.

The previous prime is 28941901. The next prime is 28941929. The reversal of 28941904 is 40914982.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 25482304 + 3459600 = 5048^2 + 1860^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28941901) 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 as a sum of consecutive naturals, namely, 904419 + ... + 904450.

It is an arithmetic number, because the mean of its divisors is an integer number (5607497).

Almost surely, 2^28941904 is an apocalyptic number.

It is an amenable number.

28941904 is a deficient number, since it is larger than the sum of its proper divisors (27133066).

28941904 is a wasteful number, since it uses less digits than its factorization.

28941904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1808877 (or 1808871 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 28941904 is about 5379.7680247386. The cubic root of 28941904 is about 307.0263852801.

The spelling of 28941904 in words is "twenty-eight million, nine hundred forty-one thousand, nine hundred four".