28295660840 has 32 divisors (see below), whose sum is σ = 63670953960. Its totient is φ = 11317248000.

The previous prime is 28295660837. The next prime is 28295660849. The reversal of 28295660840 is 4806659282.

It can be written as a sum of positive squares in 4 ways, for example, as 25019014276 + 3276646564 = 158174^2 + 57242^2 .

It is not an unprimeable number, because it can be changed into a prime (28295660849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 551480 + ... + 600600.

Almost surely, 2^28295660840 is an apocalyptic number.

28295660840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28295660840 is an abundant number, since it is smaller than the sum of its proper divisors (35375293120).

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

28295660840 is a wasteful number, since it uses less digits than its factorization.

28295660840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63533 (or 63529 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 50.

The spelling of 28295660840 in words is "twenty-eight billion, two hundred ninety-five million, six hundred sixty thousand, eight hundred forty".