28557494784 has 1200 divisors, whose sum is σ = 113793216768. Its totient is φ = 7050903552.

The previous prime is 28557494759. The next prime is 28557494813. The reversal of 28557494784 is 48749475582.

It is a happy number.

28557494784 is a `hidden beast` number, since 2 + 8 + 557 + 4 + 9 + 4 + 78 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 607606249 + ... + 607606295.

Almost surely, 2^28557494784 is an apocalyptic number.

28557494784 is a gapful number since it is divisible by the number (24) 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 28557494784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56896608384).

28557494784 is an abundant number, since it is smaller than the sum of its proper divisors (85235721984).

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

28557494784 is a wasteful number, since it uses less digits than its factorization.

28557494784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 95 counting only the distinct ones).

The product of its digits is 90316800, while the sum is 63.

The spelling of 28557494784 in words is "twenty-eight billion, five hundred fifty-seven million, four hundred ninety-four thousand, seven hundred eighty-four".