28564407 has 32 divisors (see below), whose sum is σ = 44122560. Its totient is φ = 18475776.

The previous prime is 28564397. The next prime is 28564421. The reversal of 28564407 is 70446582.

28564407 is a `hidden beast` number, since 2 + 8 + 5 + 644 + 0 + 7 = 666.

It is not a de Polignac number, because 28564407 - 2⁷ = 28564279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28564447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80743 + ... + 81095.

It is an arithmetic number, because the mean of its divisors is an integer number (1378830).

Almost surely, 2^28564407 is an apocalyptic number.

28564407 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28564407 is a deficient number, since it is larger than the sum of its proper divisors (15558153).

28564407 is an frugal number, since it uses more digits than its factorization.

28564407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 28564407 is about 5344.5679900250. The cubic root of 28564407 is about 305.6856633694.

The spelling of 28564407 in words is "twenty-eight million, five hundred sixty-four thousand, four hundred seven".