99647280 has 80 divisors (see below), whose sum is σ = 343236960. Its totient is φ = 26572032.

The previous prime is 99647243. The next prime is 99647309. The reversal of 99647280 is 8274699.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×99647280² = 19859160822796800, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 20907 + ... + 25226.

It is an arithmetic number, because the mean of its divisors is an integer number (4290462).

Almost surely, 2^99647280 is an apocalyptic number.

99647280 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

99647280 is an abundant number, since it is smaller than the sum of its proper divisors (243589680).

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

99647280 is a wasteful number, since it uses less digits than its factorization.

99647280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46155 (or 46143 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 99647280 is about 9982.3484210881. The cubic root of 99647280 is about 463.6125134004.

The spelling of 99647280 in words is "ninety-nine million, six hundred forty-seven thousand, two hundred eighty".