28263579999880 has 32 divisors (see below), whose sum is σ = 63600168326040. Its totient is φ = 11304167408640.

The previous prime is 28263579999871. The next prime is 28263579999961. The reversal of 28263579999880 is 8899997536282.

It can be written as a sum of positive squares in 4 ways, for example, as 27305871152004 + 957708847876 = 5225502^2 + 978626^2 .

It is a super-3 number, since 3×28263579999880³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39156369 + ... + 39871648.

Almost surely, 2^{28263579999880} is an apocalyptic number.

28263579999880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28263579999880 is an abundant number, since it is smaller than the sum of its proper divisors (35336588326160).

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

28263579999880 is a wasteful number, since it uses less digits than its factorization.

28263579999880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79036969 (or 79036965 counting only the distinct ones).

The product of its (nonzero) digits is 8465264640, while the sum is 85.

The spelling of 28263579999880 in words is "twenty-eight trillion, two hundred sixty-three billion, five hundred seventy-nine million, nine hundred ninety-nine thousand, eight hundred eighty".