28400055780 has 48 divisors (see below), whose sum is σ = 80609485824. Its totient is φ = 7469602560.

The previous prime is 28400055779. The next prime is 28400055797. The reversal of 28400055780 is 8755000482.

It is a super-2 number, since 2×28400055780² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3237636 + ... + 3246395.

It is an arithmetic number, because the mean of its divisors is an integer number (1679364288).

Almost surely, 2^28400055780 is an apocalyptic number.

28400055780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28400055780 is an abundant number, since it is smaller than the sum of its proper divisors (52209430044).

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

28400055780 is a wasteful number, since it uses less digits than its factorization.

28400055780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6484116 (or 6484114 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 39.

The spelling of 28400055780 in words is "twenty-eight billion, four hundred million, fifty-five thousand, seven hundred eighty".