28553391360 has 432 divisors, whose sum is σ = 109287766224. Its totient is φ = 6837239808.

The previous prime is 28553391353. The next prime is 28553391379. The reversal of 28553391360 is 6319335582.

It is a happy number.

28553391360 is a `hidden beast` number, since 2 + 8 + 553 + 3 + 91 + 3 + 6 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 22127616 + 28531263744 = 4704^2 + 168912^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5538544 + ... + 5543696.

Almost surely, 2^28553391360 is an apocalyptic number.

28553391360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28553391360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54643883112).

28553391360 is an abundant number, since it is smaller than the sum of its proper divisors (80734374864).

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

28553391360 is a wasteful number, since it uses less digits than its factorization.

28553391360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5230 (or 5213 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 45.

The spelling of 28553391360 in words is "twenty-eight billion, five hundred fifty-three million, three hundred ninety-one thousand, three hundred sixty".