28457132 has 36 divisors (see below), whose sum is σ = 56219688. Its totient is φ = 12499200.

The previous prime is 28457119. The next prime is 28457153. The reversal of 28457132 is 23175482.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41948 + ... + 42620.

It is an arithmetic number, because the mean of its divisors is an integer number (1561658).

Almost surely, 2^28457132 is an apocalyptic number.

28457132 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28457132 is a deficient number, since it is larger than the sum of its proper divisors (27762556).

28457132 is a wasteful number, since it uses less digits than its factorization.

28457132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750 (or 717 counting only the distinct ones).

The product of its digits is 13440, while the sum is 32.

The square root of 28457132 is about 5334.5226590577. The cubic root of 28457132 is about 305.3025109309.

The spelling of 28457132 in words is "twenty-eight million, four hundred fifty-seven thousand, one hundred thirty-two".