28758432 has 24 divisors (see below), whose sum is σ = 75491136. Its totient is φ = 9586112.

The previous prime is 28758409. The next prime is 28758439. The reversal of 28758432 is 23485782.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×28758432² = 1654094822197248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28758439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149688 + ... + 149879.

It is an arithmetic number, because the mean of its divisors is an integer number (3145464).

Almost surely, 2^28758432 is an apocalyptic number.

It is an amenable number.

28758432 is an abundant number, since it is smaller than the sum of its proper divisors (46732704).

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

28758432 is a wasteful number, since it uses less digits than its factorization.

28758432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299580 (or 299572 counting only the distinct ones).

The product of its digits is 107520, while the sum is 39.

The square root of 28758432 is about 5362.6888777926. The cubic root of 28758432 is about 306.3762299571.

The spelling of 28758432 in words is "twenty-eight million, seven hundred fifty-eight thousand, four hundred thirty-two".