99923635440 has 240 divisors, whose sum is σ = 345125473056. Its totient is φ = 25893273600.

The previous prime is 99923635439. The next prime is 99923635457. The reversal of 99923635440 is 4453632999.

99923635440 is a `hidden beast` number, since 9 + 9 + 92 + 3 + 6 + 3 + 544 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

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, 7580055 + ... + 7593225.

Almost surely, 2^99923635440 is an apocalyptic number.

99923635440 is a gapful number since it is divisible by the number (90) 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 99923635440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172562736528).

99923635440 is an abundant number, since it is smaller than the sum of its proper divisors (245201837616).

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

99923635440 is a wasteful number, since it uses less digits than its factorization.

99923635440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13488 (or 13479 counting only the distinct ones).

The product of its (nonzero) digits is 6298560, while the sum is 54.

The spelling of 99923635440 in words is "ninety-nine billion, nine hundred twenty-three million, six hundred thirty-five thousand, four hundred forty".