28671656 has 32 divisors (see below), whose sum is σ = 61304040. Its totient is φ = 12453888.

The previous prime is 28671653. The next prime is 28671679. The reversal of 28671656 is 65617682.

It can be written as a sum of positive squares in 4 ways, for example, as 26522500 + 2149156 = 5150^2 + 1466^2 .

It is not an unprimeable number, because it can be changed into a prime (28671653) 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, 6341 + ... + 9876.

Almost surely, 2^28671656 is an apocalyptic number.

28671656 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28671656 is an abundant number, since it is smaller than the sum of its proper divisors (32632384).

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

28671656 is a wasteful number, since it uses less digits than its factorization.

28671656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16253 (or 16249 counting only the distinct ones).

The product of its digits is 120960, while the sum is 41.

The square root of 28671656 is about 5354.5920479529. The cubic root of 28671656 is about 306.0677651905.

The spelling of 28671656 in words is "twenty-eight million, six hundred seventy-one thousand, six hundred fifty-six".