28889680 has 40 divisors (see below), whose sum is σ = 67433184. Its totient is φ = 11510400.

The previous prime is 28889639. The next prime is 28889683. The reversal of 28889680 is 8698882.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×28889680² = 1669227221004800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28889683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25935 + ... + 27025.

Almost surely, 2^28889680 is an apocalyptic number.

28889680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28889680 is an abundant number, since it is smaller than the sum of its proper divisors (38543504).

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

28889680 is a wasteful number, since it uses less digits than its factorization.

28889680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1435 (or 1429 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 49.

The square root of 28889680 is about 5374.9120923044. The cubic root of 28889680 is about 306.8416036125.

The spelling of 28889680 in words is "twenty-eight million, eight hundred eighty-nine thousand, six hundred eighty".