28811432 has 32 divisors (see below), whose sum is σ = 58401000. Its totient is φ = 13246464.

The previous prime is 28811401. The next prime is 28811441. The reversal of 28811432 is 23411882.

It can be written as a sum of positive squares in 4 ways, for example, as 12859396 + 15952036 = 3586^2 + 3994^2 .

It is a super-2 number, since 2×28811432² = 1660197227781248, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28811395 and 28811404.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46388 + ... + 47004.

Almost surely, 2^28811432 is an apocalyptic number.

It is an amenable number.

28811432 is an abundant number, since it is smaller than the sum of its proper divisors (29589568).

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

28811432 is a wasteful number, since it uses less digits than its factorization.

28811432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085 (or 1081 counting only the distinct ones).

The product of its digits is 3072, while the sum is 29.

The square root of 28811432 is about 5367.6281540360. The cubic root of 28811432 is about 306.5643252285.

The spelling of 28811432 in words is "twenty-eight million, eight hundred eleven thousand, four hundred thirty-two".