99990810 has 48 divisors (see below), whose sum is σ = 268369920. Its totient is φ = 25803360.

The previous prime is 99990799. The next prime is 99990871. The reversal of 99990810 is 1809999.

It is a super-2 number, since 2×99990810² = 19996324168912200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15130 + ... + 20709.

It is an arithmetic number, because the mean of its divisors is an integer number (5591040).

Almost surely, 2^99990810 is an apocalyptic number.

99990810 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

99990810 is an abundant number, since it is smaller than the sum of its proper divisors (168379110).

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

99990810 is a wasteful number, since it uses less digits than its factorization.

99990810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35883 (or 35880 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 99990810 is about 9999.5404894425. The cubic root of 99990810 is about 464.1446641919.

It can be divided in two parts, 999 and 90810, that added together give a square (91809 = 303²).

The spelling of 99990810 in words is "ninety-nine million, nine hundred ninety thousand, eight hundred ten".