99640325 has 12 divisors (see below), whose sum is σ = 123678468. Its totient is φ = 79632000.

The previous prime is 99640309. The next prime is 99640327. The reversal of 99640325 is 52304699.

It is a Cunningham number, because it is equal to 9982²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 1 + 99640324 = 1^2 + 9982^2 .

It is not a de Polignac number, because 99640325 - 2⁴ = 99640309 is a prime.

It is a super-2 number, since 2×99640325² = 19856388732211250, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99640327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43919 + ... + 46131.

It is an arithmetic number, because the mean of its divisors is an integer number (10306539).

Almost surely, 2^99640325 is an apocalyptic number.

It is an amenable number.

99640325 is a deficient number, since it is larger than the sum of its proper divisors (24038143).

99640325 is a wasteful number, since it uses less digits than its factorization.

99640325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4024 (or 4019 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 99640325 is about 9982.0000500902. Note that the first 4 decimals coincide. The cubic root of 99640325 is about 463.6017270211.

The spelling of 99640325 in words is "ninety-nine million, six hundred forty thousand, three hundred twenty-five".