28933947 has 24 divisors (see below), whose sum is σ = 48553440. Its totient is φ = 16260480.

The previous prime is 28933939. The next prime is 28934011. The reversal of 28933947 is 74933982.

It is a happy number.

It is not a de Polignac number, because 28933947 - 2³ = 28933939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28933547) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79 + ... + 7607.

It is an arithmetic number, because the mean of its divisors is an integer number (2023060).

Almost surely, 2^28933947 is an apocalyptic number.

28933947 is a deficient number, since it is larger than the sum of its proper divisors (19619493).

28933947 is a wasteful number, since it uses less digits than its factorization.

28933947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7603 (or 7600 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 28933947 is about 5379.0284438735. The cubic root of 28933947 is about 306.9982457715.

It can be divided in two parts, 2893394 and 7, that added together give a square (2893401 = 1701²).

The spelling of 28933947 in words is "twenty-eight million, nine hundred thirty-three thousand, nine hundred forty-seven".