28356969 has 12 divisors (see below), whose sum is σ = 40165424. Its totient is φ = 17792064.

The previous prime is 28356967. The next prime is 28356997. The reversal of 28356969 is 96965382.

It is not a de Polignac number, because 28356969 - 2¹ = 28356967 is a prime.

It is a super-2 number, since 2×28356969² = 1608235381733922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28356967) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15487 + ... + 17220.

Almost surely, 2^28356969 is an apocalyptic number.

It is an amenable number.

28356969 is a deficient number, since it is larger than the sum of its proper divisors (11808455).

28356969 is a wasteful number, since it uses less digits than its factorization.

28356969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32744 (or 32727 counting only the distinct ones).

The product of its digits is 699840, while the sum is 48.

The square root of 28356969 is about 5325.1261956878. The cubic root of 28356969 is about 304.9438900635.

The spelling of 28356969 in words is "twenty-eight million, three hundred fifty-six thousand, nine hundred sixty-nine".