28718577 has 24 divisors (see below), whose sum is σ = 43358240. Its totient is φ = 18786600.

The previous prime is 28718567. The next prime is 28718579. The reversal of 28718577 is 77581782.

28718577 is a `hidden beast` number, since 2 + 8 + 71 + 8 + 577 = 666.

It is not a de Polignac number, because 28718577 - 2⁷ = 28718449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28718579) 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, 136002 + ... + 136212.

Almost surely, 2^28718577 is an apocalyptic number.

28718577 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28718577 is a deficient number, since it is larger than the sum of its proper divisors (14639663).

28718577 is an equidigital number, since it uses as much as digits as its factorization.

28718577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362 (or 285 counting only the distinct ones).

The product of its digits is 219520, while the sum is 45.

The square root of 28718577 is about 5358.9716364243. The cubic root of 28718577 is about 306.2346335758.

The spelling of 28718577 in words is "twenty-eight million, seven hundred eighteen thousand, five hundred seventy-seven".