99642977280 has 2112 divisors, whose sum is σ = 476722391040. Its totient is φ = 19269550080.

The previous prime is 99642977261. The next prime is 99642977377. The reversal of 99642977280 is 8277924699.

99642977280 is a `hidden beast` number, since 9 + 9 + 64 + 297 + 7 + 280 = 666.

It is a tau number, because it is divible by the number of its divisors (2112).

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 191 ways as a sum of consecutive naturals, for example, 2693053422 + ... + 2693053458.

Almost surely, 2^99642977280 is an apocalyptic number.

99642977280 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 99642977280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238361195520).

99642977280 is an abundant number, since it is smaller than the sum of its proper divisors (377079413760).

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

99642977280 is a wasteful number, since it uses less digits than its factorization.

99642977280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 27433728, while the sum is 63.

The spelling of 99642977280 in words is "ninety-nine billion, six hundred forty-two million, nine hundred seventy-seven thousand, two hundred eighty".