28308632 has 32 divisors (see below), whose sum is σ = 60955200. Its totient is φ = 12189600.

The previous prime is 28308629. The next prime is 28308649. The reversal of 28308632 is 23680382.

It is a happy number.

It is a super-2 number, since 2×28308632² = 1602757291422848, which contains 22 as substring.

It is a congruent number.

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, 6794 + ... + 10137.

It is an arithmetic number, because the mean of its divisors is an integer number (1904850).

Almost surely, 2^28308632 is an apocalyptic number.

28308632 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28308632 is an abundant number, since it is smaller than the sum of its proper divisors (32646568).

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

28308632 is a wasteful number, since it uses less digits than its factorization.

28308632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16967 (or 16963 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 28308632 is about 5320.5856820467. The cubic root of 28308632 is about 304.7705234387.

The spelling of 28308632 in words is "twenty-eight million, three hundred eight thousand, six hundred thirty-two".