99729090 has 64 divisors (see below), whose sum is σ = 266872320. Its totient is φ = 26501760.

The previous prime is 99729067. The next prime is 99729103. The reversal of 99729090 is 9092799.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115942 + ... + 116798.

It is an arithmetic number, because the mean of its divisors is an integer number (4169880).

Almost surely, 2^99729090 is an apocalyptic number.

99729090 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 99729090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133436160).

99729090 is an abundant number, since it is smaller than the sum of its proper divisors (167143230).

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

99729090 is a wasteful number, since it uses less digits than its factorization.

99729090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304 (or 1298 counting only the distinct ones).

The product of its (nonzero) digits is 91854, while the sum is 45.

The square root of 99729090 is about 9986.4453135237. The cubic root of 99729090 is about 463.7393533397.

The spelling of 99729090 in words is "ninety-nine million, seven hundred twenty-nine thousand, ninety".