28881732 has 36 divisors (see below), whose sum is σ = 74077808. Its totient is φ = 8751600.

The previous prime is 28881707. The next prime is 28881733. The reversal of 28881732 is 23718882.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28881733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8494 + ... + 11397.

Almost surely, 2^28881732 is an apocalyptic number.

28881732 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28881732 is an abundant number, since it is smaller than the sum of its proper divisors (45196076).

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

28881732 is a wasteful number, since it uses less digits than its factorization.

28881732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19920 (or 19907 counting only the distinct ones).

The product of its digits is 43008, while the sum is 39.

The square root of 28881732 is about 5374.1726805156. The cubic root of 28881732 is about 306.8134620668.

The spelling of 28881732 in words is "twenty-eight million, eight hundred eighty-one thousand, seven hundred thirty-two".