28400912 has 20 divisors (see below), whose sum is σ = 55111056. Its totient is φ = 14178720.

The previous prime is 28400893. The next prime is 28400917. The reversal of 28400912 is 21900482.

It is a super-2 number, since 2×28400912² = 1613223604863488, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28400917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16643 + ... + 18269.

Almost surely, 2^28400912 is an apocalyptic number.

It is an amenable number.

28400912 is a deficient number, since it is larger than the sum of its proper divisors (26710144).

28400912 is a wasteful number, since it uses less digits than its factorization.

28400912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2726 (or 2720 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 28400912 is about 5329.2506039780. The cubic root of 28400912 is about 305.1013261835.

The spelling of 28400912 in words is "twenty-eight million, four hundred thousand, nine hundred twelve".