99409780 has 12 divisors (see below), whose sum is σ = 208760580. Its totient is φ = 39763904.

The previous prime is 99409769. The next prime is 99409799. The reversal of 99409780 is 8790499.

It can be written as a sum of positive squares in 2 ways, for example, as 60621796 + 38787984 = 7786^2 + 6228^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 99409780.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2485225 + ... + 2485264.

It is an arithmetic number, because the mean of its divisors is an integer number (17396715).

Almost surely, 2^99409780 is an apocalyptic number.

It is an amenable number.

99409780 is an abundant number, since it is smaller than the sum of its proper divisors (109350800).

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

99409780 is a wasteful number, since it uses less digits than its factorization.

99409780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4970498 (or 4970496 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 99409780 is about 9970.4453260624. The cubic root of 99409780 is about 463.2438946573.

The spelling of 99409780 in words is "ninety-nine million, four hundred nine thousand, seven hundred eighty".