28633720 has 16 divisors (see below), whose sum is σ = 64425960. Its totient is φ = 11453472.

The previous prime is 28633697. The next prime is 28633733. The reversal of 28633720 is 2733682.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 357882 + ... + 357961.

Almost surely, 2^28633720 is an apocalyptic number.

28633720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28633720 is an abundant number, since it is smaller than the sum of its proper divisors (35792240).

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

28633720 is a wasteful number, since it uses less digits than its factorization.

28633720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715854 (or 715850 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 28633720 is about 5351.0484953885. The cubic root of 28633720 is about 305.9327176321.

The spelling of 28633720 in words is "twenty-eight million, six hundred thirty-three thousand, seven hundred twenty".