99999999770 has 64 divisors (see below), whose sum is σ = 203929837056. Its totient is φ = 34987740480.

The previous prime is 99999999769. The next prime is 99999999821. The reversal of 99999999770 is 7799999999.

99999999770 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (86).

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 159137 + ... + 474683.

It is an arithmetic number, because the mean of its divisors is an integer number (3186403704).

Almost surely, 2^99999999770 is an apocalyptic number.

99999999770 is an abundant number, since it is smaller than the sum of its proper divisors (103929837286).

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

99999999770 is a wasteful number, since it uses less digits than its factorization.

99999999770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315675.

The product of its (nonzero) digits is 2109289329, while the sum is 86.

The spelling of 99999999770 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, seven hundred seventy".