28011580 has 24 divisors (see below), whose sum is σ = 62285328. Its totient is φ = 10545408.

The previous prime is 28011551. The next prime is 28011611. The reversal of 28011580 is 8511082.

It is a super-2 number, since 2×28011580² = 1569297228192800, 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, 40854 + ... + 41533.

It is an arithmetic number, because the mean of its divisors is an integer number (2595222).

Almost surely, 2^28011580 is an apocalyptic number.

28011580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28011580 is an abundant number, since it is smaller than the sum of its proper divisors (34273748).

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

28011580 is a wasteful number, since it uses less digits than its factorization.

28011580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82413 (or 82411 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 28011580 is about 5292.5967161687. The cubic root of 28011580 is about 303.7007529659.

The spelling of 28011580 in words is "twenty-eight million, eleven thousand, five hundred eighty".