99661072 has 60 divisors (see below), whose sum is σ = 234498880. Its totient is φ = 40186368.

The previous prime is 99661039. The next prime is 99661073. The reversal of 99661072 is 27016699.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99661073) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30829 + ... + 33907.

Almost surely, 2^99661072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99661072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117249440).

99661072 is an abundant number, since it is smaller than the sum of its proper divisors (134837808).

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

99661072 is a wasteful number, since it uses less digits than its factorization.

99661072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3128 (or 3105 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 99661072 is about 9983.0392165913. The cubic root of 99661072 is about 463.6339016704.

The spelling of 99661072 in words is "ninety-nine million, six hundred sixty-one thousand, seventy-two".