28716680 has 16 divisors (see below), whose sum is σ = 64612620. Its totient is φ = 11486656.

The previous prime is 28716643. The next prime is 28716683. The reversal of 28716680 is 8661782.

It can be written as a sum of positive squares in 2 ways, for example, as 23990404 + 4726276 = 4898^2 + 2174^2 .

It is not an unprimeable number, because it can be changed into a prime (28716683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358919 + ... + 358998.

Almost surely, 2^28716680 is an apocalyptic number.

28716680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28716680 is an abundant number, since it is smaller than the sum of its proper divisors (35895940).

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

28716680 is a wasteful number, since it uses less digits than its factorization.

28716680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717928 (or 717924 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 28716680 is about 5358.7946405885. The cubic root of 28716680 is about 306.2278906710.

The spelling of 28716680 in words is "twenty-eight million, seven hundred sixteen thousand, six hundred eighty".