28504140 has 48 divisors (see below), whose sum is σ = 91214592. Its totient is φ = 6515136.

The previous prime is 28504111. The next prime is 28504181. The reversal of 28504140 is 4140582.

It is a self number, because there is not a number n which added to its sum of digits gives 28504140.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33514 + ... + 34353.

It is an arithmetic number, because the mean of its divisors is an integer number (1900304).

Almost surely, 2^28504140 is an apocalyptic number.

28504140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28504140 is an abundant number, since it is smaller than the sum of its proper divisors (62710452).

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

28504140 is a wasteful number, since it uses less digits than its factorization.

28504140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67886 (or 67884 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 28504140 is about 5338.9268584614. The cubic root of 28504140 is about 305.4705269867.

The spelling of 28504140 in words is "twenty-eight million, five hundred four thousand, one hundred forty".