28904736 has 48 divisors (see below), whose sum is σ = 86716224. Its totient is φ = 8258304.

The previous prime is 28904731. The next prime is 28904737. The reversal of 28904736 is 63740982.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 28904694 and 28904703.

It is not an unprimeable number, because it can be changed into a prime (28904731) 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, 20835 + ... + 22178.

It is an arithmetic number, because the mean of its divisors is an integer number (1806588).

Almost surely, 2^28904736 is an apocalyptic number.

It is an amenable number.

28904736 is an abundant number, since it is smaller than the sum of its proper divisors (57811488).

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

28904736 is a wasteful number, since it uses less digits than its factorization.

28904736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43033 (or 43025 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 28904736 is about 5376.3124909179. The cubic root of 28904736 is about 306.8948983631.

It can be divided in two parts, 2890 and 4736, that added together give a triangular number (7626 = T₁₂₃).

The spelling of 28904736 in words is "twenty-eight million, nine hundred four thousand, seven hundred thirty-six".