28701564 has 24 divisors (see below), whose sum is σ = 67076688. Its totient is φ = 9552000.

The previous prime is 28701551. The next prime is 28701601. The reversal of 28701564 is 46510782.

It is a super-4 number, since 4×28701564⁴ (a number of 31 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8064 + ... + 11064.

It is an arithmetic number, because the mean of its divisors is an integer number (2794862).

Almost surely, 2^28701564 is an apocalyptic number.

It is an amenable number.

28701564 is an abundant number, since it is smaller than the sum of its proper divisors (38375124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28701564 is a wasteful number, since it uses less digits than its factorization.

28701564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3805 (or 3803 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 28701564 is about 5357.3840631413. The cubic root of 28701564 is about 306.1741500896.

The spelling of 28701564 in words is "twenty-eight million, seven hundred one thousand, five hundred sixty-four".