28972647 has 28 divisors (see below), whose sum is σ = 47401224. Its totient is φ = 17554320.

The previous prime is 28972613. The next prime is 28972649. The reversal of 28972647 is 74627982.

It is not a de Polignac number, because 28972647 - 2⁷ = 28972519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28972649) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 6213 + ... + 9825.

Almost surely, 2^28972647 is an apocalyptic number.

28972647 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28972647 is a deficient number, since it is larger than the sum of its proper divisors (18428577).

28972647 is an equidigital number, since it uses as much as digits as its factorization.

28972647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3642 (or 3627 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 28972647 is about 5382.6245457026. The cubic root of 28972647 is about 307.1350578359.

The spelling of 28972647 in words is "twenty-eight million, nine hundred seventy-two thousand, six hundred forty-seven".