28656980 has 24 divisors (see below), whose sum is σ = 65651040. Its totient is φ = 10420640.

The previous prime is 28656973. The next prime is 28656983. The reversal of 28656980 is 8965682.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28656983) 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, 64910 + ... + 65349.

It is an arithmetic number, because the mean of its divisors is an integer number (2735460).

Almost surely, 2^28656980 is an apocalyptic number.

28656980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28656980 is an abundant number, since it is smaller than the sum of its proper divisors (36994060).

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

28656980 is a wasteful number, since it uses less digits than its factorization.

28656980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130279 (or 130277 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 44.

The square root of 28656980 is about 5353.2214600183. The cubic root of 28656980 is about 306.0155345468.

The spelling of 28656980 in words is "twenty-eight million, six hundred fifty-six thousand, nine hundred eighty".