28357484880 has 80 divisors (see below), whose sum is σ = 87988296960. Its totient is φ = 7555106304.

The previous prime is 28357484879. The next prime is 28357484923. The reversal of 28357484880 is 8848475382.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×28357484880² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28357484880.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212889 + ... + 319431.

It is an arithmetic number, because the mean of its divisors is an integer number (1099853712).

Almost surely, 2^28357484880 is an apocalyptic number.

28357484880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28357484880 is an abundant number, since it is smaller than the sum of its proper divisors (59630812080).

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

28357484880 is a wasteful number, since it uses less digits than its factorization.

28357484880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107668 (or 107662 counting only the distinct ones).

The product of its (nonzero) digits is 13762560, while the sum is 57.

The spelling of 28357484880 in words is "twenty-eight billion, three hundred fifty-seven million, four hundred eighty-four thousand, eight hundred eighty".