28636580 has 36 divisors (see below), whose sum is σ = 69957468. Its totient is φ = 9817920.

The previous prime is 28636571. The next prime is 28636603. The reversal of 28636580 is 8563682.

It can be written as a sum of positive squares in 2 ways, for example, as 4351396 + 24285184 = 2086^2 + 4928^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13631 + ... + 15590.

It is an arithmetic number, because the mean of its divisors is an integer number (1943263).

Almost surely, 2^28636580 is an apocalyptic number.

28636580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28636580 is an abundant number, since it is smaller than the sum of its proper divisors (41320888).

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

28636580 is a wasteful number, since it uses less digits than its factorization.

28636580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29244 (or 29235 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 28636580 is about 5351.3157260621. The cubic root of 28636580 is about 305.9429030410.

The spelling of 28636580 in words is "twenty-eight million, six hundred thirty-six thousand, five hundred eighty".