28379720 has 32 divisors (see below), whose sum is σ = 64006200. Its totient is φ = 11324928.

The previous prime is 28379713. The next prime is 28379753. The reversal of 28379720 is 2797382.

It can be written as a sum of positive squares in 4 ways, for example, as 28281124 + 98596 = 5318^2 + 314^2 .

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, 31922 + ... + 32798.

Almost surely, 2^28379720 is an apocalyptic number.

28379720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28379720 is an abundant number, since it is smaller than the sum of its proper divisors (35626480).

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

28379720 is a wasteful number, since it uses less digits than its factorization.

28379720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1697 (or 1693 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 28379720 is about 5327.2619608951. The cubic root of 28379720 is about 305.0254211545.

The spelling of 28379720 in words is "twenty-eight million, three hundred seventy-nine thousand, seven hundred twenty".