99609680 has 20 divisors (see below), whose sum is σ = 231592692. Its totient is φ = 39843840.

The previous prime is 99609677. The next prime is 99609683. The reversal of 99609680 is 8690699.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (99609677) and next prime (99609683).

It can be written as a sum of positive squares in 2 ways, for example, as 16289296 + 83320384 = 4036^2 + 9128^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99609683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 622481 + ... + 622640.

Almost surely, 2^99609680 is an apocalyptic number.

It is an amenable number.

99609680 is an abundant number, since it is smaller than the sum of its proper divisors (131983012).

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

99609680 is a wasteful number, since it uses less digits than its factorization.

99609680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245134 (or 1245128 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 99609680 is about 9980.4649190306. The cubic root of 99609680 is about 463.5541942856.

The spelling of 99609680 in words is "ninety-nine million, six hundred nine thousand, six hundred eighty".