99390644 has 12 divisors (see below), whose sum is σ = 174243300. Its totient is φ = 49606848.

The previous prime is 99390631. The next prime is 99390671. The reversal of 99390644 is 44609399.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28494244 + 70896400 = 5338^2 + 8420^2 .

It is a super-2 number, since 2×99390644² = 19757000229469472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 99390595 and 99390604.

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, 19559 + ... + 24110.

It is an arithmetic number, because the mean of its divisors is an integer number (14520275).

Almost surely, 2^99390644 is an apocalyptic number.

It is an amenable number.

99390644 is a deficient number, since it is larger than the sum of its proper divisors (74852656).

99390644 is a wasteful number, since it uses less digits than its factorization.

99390644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44242 (or 44240 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 99390644 is about 9969.4856437030. The cubic root of 99390644 is about 463.2141685276.

The spelling of 99390644 in words is "ninety-nine million, three hundred ninety thousand, six hundred forty-four".