28564349923705 has 32 divisors (see below), whose sum is σ = 36689674563360. Its totient is φ = 21272787025920.

The previous prime is 28564349923621. The next prime is 28564349923799. The reversal of 28564349923705 is 50732994346582.

It can be written as a sum of positive squares in 16 ways, for example, as 8840518836601 + 19723831087104 = 2973301^2 + 4441152^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28564349923705 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12723025 + ... + 14798785.

It is an arithmetic number, because the mean of its divisors is an integer number (1146552330105).

Almost surely, 2^{28564349923705} is an apocalyptic number.

It is an amenable number.

28564349923705 is a deficient number, since it is larger than the sum of its proper divisors (8125324639655).

28564349923705 is a wasteful number, since it uses less digits than its factorization.

28564349923705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2077549.

The product of its (nonzero) digits is 391910400, while the sum is 67.

The spelling of 28564349923705 in words is "twenty-eight trillion, five hundred sixty-four billion, three hundred forty-nine million, nine hundred twenty-three thousand, seven hundred five".