917488640 has 176 divisors, whose sum is σ = 2377009152. Its totient is φ = 338558976.

The previous prime is 917488619. The next prime is 917488669. The reversal of 917488640 is 46884719.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7224257 + ... + 7224383.

Almost surely, 2^917488640 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 917488640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1188504576).

917488640 is an abundant number, since it is smaller than the sum of its proper divisors (1459520512).

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

917488640 is a wasteful number, since it uses less digits than its factorization.

917488640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252 (or 234 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 47.

The square root of 917488640 is about 30290.0749421324. The cubic root of 917488640 is about 971.7030484896.

The spelling of 917488640 in words is "nine hundred seventeen million, four hundred eighty-eight thousand, six hundred forty".