99581952 has 64 divisors (see below), whose sum is σ = 265809960. Its totient is φ = 33161216.

The previous prime is 99581947. The next prime is 99581987. The reversal of 99581952 is 25918599.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97798 + ... + 98810.

Almost surely, 2^99581952 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 99581952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132904980).

99581952 is an abundant number, since it is smaller than the sum of its proper divisors (166228008).

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

99581952 is an equidigital number, since it uses as much as digits as its factorization.

99581952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046 (or 1018 counting only the distinct ones).

The product of its digits is 291600, while the sum is 48.

The square root of 99581952 is about 9979.0757087017. The cubic root of 99581952 is about 463.5111776379.

The spelling of 99581952 in words is "ninety-nine million, five hundred eighty-one thousand, nine hundred fifty-two".