99771560 has 32 divisors (see below), whose sum is σ = 256556160. Its totient is φ = 34207296.

The previous prime is 99771541. The next prime is 99771563. The reversal of 99771560 is 6517799.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (99771563) 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, 177884 + ... + 178443.

It is an arithmetic number, because the mean of its divisors is an integer number (8017380).

Almost surely, 2^99771560 is an apocalyptic number.

It is an amenable number.

99771560 is an abundant number, since it is smaller than the sum of its proper divisors (156784600).

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

99771560 is a wasteful number, since it uses less digits than its factorization.

99771560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356345 (or 356341 counting only the distinct ones).

The product of its (nonzero) digits is 119070, while the sum is 44.

The square root of 99771560 is about 9988.5714694345. The cubic root of 99771560 is about 463.8051723675.

The spelling of 99771560 in words is "ninety-nine million, seven hundred seventy-one thousand, five hundred sixty".