28581509356 has 12 divisors (see below), whose sum is σ = 50023864800. Its totient is φ = 14288976560.

The previous prime is 28581509347. The next prime is 28581509357. The reversal of 28581509356 is 65390518582.

It is not an unprimeable number, because it can be changed into a prime (28581509357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 408031 + ... + 472918.

It is an arithmetic number, because the mean of its divisors is an integer number (4168655400).

Almost surely, 2^28581509356 is an apocalyptic number.

It is an amenable number.

28581509356 is a deficient number, since it is larger than the sum of its proper divisors (21442355444).

28581509356 is a wasteful number, since it uses less digits than its factorization.

28581509356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889064 (or 889062 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 52.

The spelling of 28581509356 in words is "twenty-eight billion, five hundred eighty-one million, five hundred nine thousand, three hundred fifty-six".