28888940 has 12 divisors (see below), whose sum is σ = 60666816. Its totient is φ = 11555568.

The previous prime is 28888939. The next prime is 28888963. The reversal of 28888940 is 4988882.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 722204 + ... + 722243.

It is an arithmetic number, because the mean of its divisors is an integer number (5055568).

Almost surely, 2^28888940 is an apocalyptic number.

28888940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28888940 is an abundant number, since it is smaller than the sum of its proper divisors (31777876).

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

28888940 is a wasteful number, since it uses less digits than its factorization.

28888940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1444456 (or 1444454 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 47.

The square root of 28888940 is about 5374.8432535284. The cubic root of 28888940 is about 306.8389837066.

The spelling of 28888940 in words is "twenty-eight million, eight hundred eighty-eight thousand, nine hundred forty".