99779236392 has 128 divisors (see below), whose sum is σ = 279854870400. Its totient is φ = 29383065600.

The previous prime is 99779236391. The next prime is 99779236393. The reversal of 99779236392 is 29363297799.

It is an interprime number because it is at equal distance from previous prime (99779236391) and next prime (99779236393).

It is a Harshad number since it is a multiple of its sum of digits (66).

It is not an unprimeable number, because it can be changed into a prime (99779236391) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2763834 + ... + 2799702.

It is an arithmetic number, because the mean of its divisors is an integer number (2186366175).

Almost surely, 2^99779236392 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 99779236392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139927435200).

99779236392 is an abundant number, since it is smaller than the sum of its proper divisors (180075634008).

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

99779236392 is a wasteful number, since it uses less digits than its factorization.

99779236392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36187 (or 36183 counting only the distinct ones).

The product of its digits is 69441624, while the sum is 66.

The spelling of 99779236392 in words is "ninety-nine billion, seven hundred seventy-nine million, two hundred thirty-six thousand, three hundred ninety-two".