28398557376 has 336 divisors, whose sum is σ = 96838942720. Its totient is φ = 7785953280.

The previous prime is 28398557359. The next prime is 28398557387. The reversal of 28398557376 is 67375589382.

28398557376 is a `hidden beast` number, since 2 + 8 + 3 + 9 + 8 + 557 + 3 + 76 = 666.

It is a tau number, because it is divible by the number of its divisors (336).

It is a super-2 number, since 2×28398557376² (a number of 22 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15873090 + ... + 15874878.

Almost surely, 2^28398557376 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28398557376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48419471360).

28398557376 is an abundant number, since it is smaller than the sum of its proper divisors (68440385344).

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

28398557376 is a wasteful number, since it uses less digits than its factorization.

28398557376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1972 (or 1959 counting only the distinct ones).

The product of its digits is 76204800, while the sum is 63.

The spelling of 28398557376 in words is "twenty-eight billion, three hundred ninety-eight million, five hundred fifty-seven thousand, three hundred seventy-six".