28315961856 has 960 divisors, whose sum is σ = 108601549056. Its totient is φ = 7166361600.

The previous prime is 28315961809. The next prime is 28315961857. The reversal of 28315961856 is 65816951382.

28315961856 is a `hidden beast` number, since 2 + 8 + 3 + 15 + 9 + 618 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28315961857) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 464196066 + ... + 464196126.

Almost surely, 2^28315961856 is an apocalyptic number.

28315961856 is a gapful number since it is divisible by the number (26) 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 28315961856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54300774528).

28315961856 is an abundant number, since it is smaller than the sum of its proper divisors (80285587200).

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

28315961856 is an equidigital number, since it uses as much as digits as its factorization.

28315961856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 127 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 54.

The spelling of 28315961856 in words is "twenty-eight billion, three hundred fifteen million, nine hundred sixty-one thousand, eight hundred fifty-six".