28981660 has 24 divisors (see below), whose sum is σ = 61493040. Its totient is φ = 11472384.

The previous prime is 28981637. The next prime is 28981661. The reversal of 28981660 is 6618982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28981661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5530 + ... + 9409.

It is an arithmetic number, because the mean of its divisors is an integer number (2562210).

Almost surely, 2^28981660 is an apocalyptic number.

28981660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28981660 is an abundant number, since it is smaller than the sum of its proper divisors (32511380).

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

28981660 is a wasteful number, since it uses less digits than its factorization.

28981660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15045 (or 15043 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 28981660 is about 5383.4617115756. The cubic root of 28981660 is about 307.1669030596.

The spelling of 28981660 in words is "twenty-eight million, nine hundred eighty-one thousand, six hundred sixty".