28313520 has 40 divisors (see below), whose sum is σ = 87772656. Its totient is φ = 7550208.

The previous prime is 28313503. The next prime is 28313531. The reversal of 28313520 is 2531382.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 58747 + ... + 59226.

Almost surely, 2^28313520 is an apocalyptic number.

28313520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28313520 is an abundant number, since it is smaller than the sum of its proper divisors (59459136).

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

28313520 is a wasteful number, since it uses less digits than its factorization.

28313520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117989 (or 117983 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 28313520 is about 5321.0450101460. The cubic root of 28313520 is about 304.7880638198.

The spelling of 28313520 in words is "twenty-eight million, three hundred thirteen thousand, five hundred twenty".