99774640 has 40 divisors (see below), whose sum is σ = 265116960. Its totient is φ = 34208256.

The previous prime is 99774601. The next prime is 99774641. The reversal of 99774640 is 4647799.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (99774641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88525 + ... + 89644.

It is an arithmetic number, because the mean of its divisors is an integer number (6627924).

Almost surely, 2^99774640 is an apocalyptic number.

It is an amenable number.

99774640 is an abundant number, since it is smaller than the sum of its proper divisors (165342320).

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

99774640 is a wasteful number, since it uses less digits than its factorization.

99774640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178189 (or 178183 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 46.

The square root of 99774640 is about 9988.7256444453. The cubic root of 99774640 is about 463.8099449541.

The spelling of 99774640 in words is "ninety-nine million, seven hundred seventy-four thousand, six hundred forty".