28561173907 has 16 divisors (see below), whose sum is σ = 33046175232. Its totient is φ = 24177588480.

The previous prime is 28561173857. The next prime is 28561173911. The reversal of 28561173907 is 70937116582.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28561173907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28561173937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2094682 + ... + 2108272.

It is an arithmetic number, because the mean of its divisors is an integer number (2065385952).

Almost surely, 2^28561173907 is an apocalyptic number.

28561173907 is a deficient number, since it is larger than the sum of its proper divisors (4485001325).

28561173907 is a wasteful number, since it uses less digits than its factorization.

28561173907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17298.

The product of its (nonzero) digits is 635040, while the sum is 49.

The spelling of 28561173907 in words is "twenty-eight billion, five hundred sixty-one million, one hundred seventy-three thousand, nine hundred seven".