28197732 has 12 divisors (see below), whose sum is σ = 65794736. Its totient is φ = 9399240.

The previous prime is 28197731. The next prime is 28197733. The reversal of 28197732 is 23779182.

It is an interprime number because it is at equal distance from previous prime (28197731) and next prime (28197733).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×28197732² = 1590224179887648, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28197731) 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, 1174894 + ... + 1174917.

Almost surely, 2^28197732 is an apocalyptic number.

It is an amenable number.

28197732 is an abundant number, since it is smaller than the sum of its proper divisors (37597004).

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

28197732 is a wasteful number, since it uses less digits than its factorization.

28197732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2349818 (or 2349816 counting only the distinct ones).

The product of its digits is 42336, while the sum is 39.

The square root of 28197732 is about 5310.1536700928. The cubic root of 28197732 is about 304.3720197401.

The spelling of 28197732 in words is "twenty-eight million, one hundred ninety-seven thousand, seven hundred thirty-two".