28742904 has 32 divisors (see below), whose sum is σ = 79842000. Its totient is φ = 9580896.

The previous prime is 28742887. The next prime is 28742941. The reversal of 28742904 is 40924782.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66319 + ... + 66750.

Almost surely, 2^28742904 is an apocalyptic number.

28742904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28742904 is an abundant number, since it is smaller than the sum of its proper divisors (51099096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28742904 is a wasteful number, since it uses less digits than its factorization.

28742904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133084 (or 133074 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 28742904 is about 5361.2409011347. The cubic root of 28742904 is about 306.3210778240.

It can be divided in two parts, 28742 and 904, that added together give a triangular number (29646 = T₂₄₃).

The spelling of 28742904 in words is "twenty-eight million, seven hundred forty-two thousand, nine hundred four".