99780318 has 48 divisors (see below), whose sum is σ = 238867200. Its totient is φ = 29849040.

The previous prime is 99780313. The next prime is 99780319. The reversal of 99780318 is 81308799.

It is a super-2 number, since 2×99780318² = 19912223720362248, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99780313) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12453 + ... + 18831.

It is an arithmetic number, because the mean of its divisors is an integer number (4976400).

Almost surely, 2^99780318 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99780318, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119433600).

99780318 is an abundant number, since it is smaller than the sum of its proper divisors (139086882).

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

99780318 is a wasteful number, since it uses less digits than its factorization.

99780318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6477 (or 6474 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 99780318 is about 9989.0098608421. The cubic root of 99780318 is about 463.8187429911.

The spelling of 99780318 in words is "ninety-nine million, seven hundred eighty thousand, three hundred eighteen".