99990625 has 36 divisors (see below), whose sum is σ = 145607868. Its totient is φ = 68460000.

The previous prime is 99990589. The next prime is 99990641. The reversal of 99990625 is 52609999.

It can be written as a sum of positive squares in 6 ways, for example, as 91833889 + 8156736 = 9583^2 + 2856^2 .

It is not a de Polignac number, because 99990625 - 2⁹ = 99990113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 152799 + ... + 153451.

It is an arithmetic number, because the mean of its divisors is an integer number (4044663).

Almost surely, 2^99990625 is an apocalyptic number.

It is an amenable number.

99990625 is a deficient number, since it is larger than the sum of its proper divisors (45617243).

99990625 is an frugal number, since it uses more digits than its factorization.

99990625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692 (or 665 counting only the distinct ones).

The product of its (nonzero) digits is 393660, while the sum is 49.

The square root of 99990625 is about 9999.5312390132. The cubic root of 99990625 is about 464.1443779429.

The spelling of 99990625 in words is "ninety-nine million, nine hundred ninety thousand, six hundred twenty-five".