28891672 has 16 divisors (see below), whose sum is σ = 55636560. Its totient is φ = 14055264.

The previous prime is 28891669. The next prime is 28891679. The reversal of 28891672 is 27619882.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28891679) 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, 48508 + ... + 49099.

It is an arithmetic number, because the mean of its divisors is an integer number (3477285).

Almost surely, 2^28891672 is an apocalyptic number.

It is an amenable number.

28891672 is a deficient number, since it is larger than the sum of its proper divisors (26744888).

28891672 is a wasteful number, since it uses less digits than its factorization.

28891672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97650 (or 97646 counting only the distinct ones).

The product of its digits is 96768, while the sum is 43.

The square root of 28891672 is about 5375.0973944664. The cubic root of 28891672 is about 306.8486558935.

The spelling of 28891672 in words is "twenty-eight million, eight hundred ninety-one thousand, six hundred seventy-two".