28155732 has 36 divisors (see below), whose sum is σ = 72215808. Its totient is φ = 8531600.

The previous prime is 28155727. The next prime is 28155737. The reversal of 28155732 is 23755182.

It is an interprime number because it is at equal distance from previous prime (28155727) and next prime (28155737).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 28155693 and 28155702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28155737) 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, 8244 + ... + 11147.

Almost surely, 2^28155732 is an apocalyptic number.

28155732 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28155732 is an abundant number, since it is smaller than the sum of its proper divisors (44060076).

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

28155732 is a wasteful number, since it uses less digits than its factorization.

28155732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19420 (or 19407 counting only the distinct ones).

The product of its digits is 16800, while the sum is 33.

The square root of 28155732 is about 5306.1975085743. The cubic root of 28155732 is about 304.2208258181.

The spelling of 28155732 in words is "twenty-eight million, one hundred fifty-five thousand, seven hundred thirty-two".