99997660 has 48 divisors (see below), whose sum is σ = 241145856. Its totient is φ = 34120512.

The previous prime is 99997649. The next prime is 99997669. The reversal of 99997660 is 6679999.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99997669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29619 + ... + 32821.

It is an arithmetic number, because the mean of its divisors is an integer number (5023872).

Almost surely, 2^99997660 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 99997660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120572928).

99997660 is an abundant number, since it is smaller than the sum of its proper divisors (141148196).

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

99997660 is a wasteful number, since it uses less digits than its factorization.

99997660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3442 (or 3440 counting only the distinct ones).

The product of its (nonzero) digits is 1653372, while the sum is 55.

The square root of 99997660 is about 9999.8829993155. The cubic root of 99997660 is about 464.1552628937.

The spelling of 99997660 in words is "ninety-nine million, nine hundred ninety-seven thousand, six hundred sixty".