991764480 has 224 divisors, whose sum is σ = 3629948544. Its totient is φ = 226492416.

The previous prime is 991764419. The next prime is 991764497. The reversal of 991764480 is 84467199.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 859584 + ... + 860736.

Almost surely, 2^991764480 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 991764480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1814974272).

991764480 is an abundant number, since it is smaller than the sum of its proper divisors (2638184064).

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

991764480 is a wasteful number, since it uses less digits than its factorization.

991764480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1194 (or 1170 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 991764480 is about 31492.2923903612. The cubic root of 991764480 is about 997.2472560203.

The spelling of 991764480 in words is "nine hundred ninety-one million, seven hundred sixty-four thousand, four hundred eighty".