99664380 has 144 divisors (see below), whose sum is σ = 318898944. Its totient is φ = 25159680.

The previous prime is 99664363. The next prime is 99664381. The reversal of 99664380 is 8346699.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99664381) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 295572 + ... + 295908.

It is an arithmetic number, because the mean of its divisors is an integer number (2214576).

Almost surely, 2^99664380 is an apocalyptic number.

99664380 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99664380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159449472).

99664380 is an abundant number, since it is smaller than the sum of its proper divisors (219234564).

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

99664380 is a wasteful number, since it uses less digits than its factorization.

99664380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 99664380 is about 9983.2048962245. The cubic root of 99664380 is about 463.6390313362.

The spelling of 99664380 in words is "ninety-nine million, six hundred sixty-four thousand, three hundred eighty".