991347264 has 168 divisors, whose sum is σ = 2986064640. Its totient is φ = 314035200.

The previous prime is 991347251. The next prime is 991347277. The reversal of 991347264 is 462743199.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (991347251) and next prime (991347277).

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, 1053034 + ... + 1053974.

Almost surely, 2^991347264 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 991347264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1493032320).

991347264 is an abundant number, since it is smaller than the sum of its proper divisors (1994717376).

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

991347264 is a wasteful number, since it uses less digits than its factorization.

991347264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049 (or 1036 counting only the distinct ones).

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

The square root of 991347264 is about 31485.6675965430. The cubic root of 991347264 is about 997.1073955739.

The spelling of 991347264 in words is "nine hundred ninety-one million, three hundred forty-seven thousand, two hundred sixty-four".