99766440 has 96 divisors (see below), whose sum is σ = 327698280. Its totient is φ = 26320896.

The previous prime is 99766427. The next prime is 99766481. The reversal of 99766440 is 4466799.

It can be written as a sum of positive squares in 4 ways, for example, as 84603204 + 15163236 = 9198^2 + 3894^2 .

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

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33492 + ... + 36348.

Almost surely, 2^99766440 is an apocalyptic number.

99766440 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 99766440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163849140).

99766440 is an abundant number, since it is smaller than the sum of its proper divisors (227931840).

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

99766440 is a wasteful number, since it uses less digits than its factorization.

99766440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2971 (or 2964 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 99766440 is about 9988.3151732412. The cubic root of 99766440 is about 463.7972384997.

The spelling of 99766440 in words is "ninety-nine million, seven hundred sixty-six thousand, four hundred forty".