99778560 has 256 divisors, whose sum is σ = 377481600. Its totient is φ = 22020096.

The previous prime is 99778541. The next prime is 99778561. The reversal of 99778560 is 6587799.

It is a tau number, because it is divible by the number of its divisors (256).

It is a super-2 number, since 2×99778560² = 19911522071347200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99778561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3440626 + ... + 3440654.

Almost surely, 2^99778560 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 99778560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188740800).

99778560 is an abundant number, since it is smaller than the sum of its proper divisors (277703040).

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

99778560 is an equidigital number, since it uses as much as digits as its factorization.

99778560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74 (or 46 counting only the distinct ones).

The product of its (nonzero) digits is 952560, while the sum is 51.

The square root of 99778560 is about 9988.9218637449. The cubic root of 99778560 is about 463.8160190132.

The spelling of 99778560 in words is "ninety-nine million, seven hundred seventy-eight thousand, five hundred sixty".