28207980 has 48 divisors (see below), whose sum is σ = 87759840. Its totient is φ = 7521984.

The previous prime is 28207979. The next prime is 28207997. The reversal of 28207980 is 8970282.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25579 + ... + 26658.

It is an arithmetic number, because the mean of its divisors is an integer number (1828330).

Almost surely, 2^28207980 is an apocalyptic number.

28207980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28207980 is an abundant number, since it is smaller than the sum of its proper divisors (59551860).

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

28207980 is a wasteful number, since it uses less digits than its factorization.

28207980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52255 (or 52247 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 28207980 is about 5311.1185262617. The cubic root of 28207980 is about 304.4088882687.

The spelling of 28207980 in words is "twenty-eight million, two hundred seven thousand, nine hundred eighty".