28570905 has 24 divisors (see below), whose sum is σ = 54025920. Its totient is φ = 13852320.

The previous prime is 28570879. The next prime is 28570907. The reversal of 28570905 is 50907582.

It is not a de Polignac number, because 28570905 - 2⁸ = 28570649 is a prime.

It is a super-2 number, since 2×28570905² = 1632593225038050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28570905.

It is not an unprimeable number, because it can be changed into a prime (28570907) 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, 28365 + ... + 29354.

It is an arithmetic number, because the mean of its divisors is an integer number (2251080).

Almost surely, 2^28570905 is an apocalyptic number.

It is an amenable number.

28570905 is a deficient number, since it is larger than the sum of its proper divisors (25455015).

28570905 is a wasteful number, since it uses less digits than its factorization.

28570905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57741 (or 57738 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 28570905 is about 5345.1758624015. The cubic root of 28570905 is about 305.7088413386.

The spelling of 28570905 in words is "twenty-eight million, five hundred seventy thousand, nine hundred five".