28400932 has 12 divisors (see below), whose sum is σ = 56801920. Its totient is φ = 12171816.

The previous prime is 28400927. The next prime is 28400959. The reversal of 28400932 is 23900482.

28400932 is an admirable number.

It is a super-2 number, since 2×28400932² = 1613225876937248, which contains 22 as substring.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 1014319 = 28400932 / (2 + 8 + 4 + 0 + 0 + 9 + 3 + 2).

It is a self number, because there is not a number n which added to its sum of digits gives 28400932.

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, 507132 + ... + 507187.

Almost surely, 2^28400932 is an apocalyptic number.

It is an amenable number.

28400932 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28400932 is a wasteful number, since it uses less digits than its factorization.

28400932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014330 (or 1014328 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 28400932 is about 5329.2524804141. The cubic root of 28400932 is about 305.1013978012.

It can be divided in two parts, 28 and 400932, that added together give a triangular number (400960 = T₈₉₅).

The spelling of 28400932 in words is "twenty-eight million, four hundred thousand, nine hundred thirty-two".