917109828 has 72 divisors (see below), whose sum is σ = 2422108416. Its totient is φ = 292248000.

The previous prime is 917109821. The next prime is 917109899. The reversal of 917109828 is 828901719.

It is a super-2 number, since 2×917109828² = 1682180873228379168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (917109821) 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, 87678 + ... + 97578.

Almost surely, 2^917109828 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 917109828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1211054208).

917109828 is an abundant number, since it is smaller than the sum of its proper divisors (1504998588).

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

917109828 is a wasteful number, since it uses less digits than its factorization.

917109828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10025 (or 10020 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 45.

The square root of 917109828 is about 30283.8212252021. The cubic root of 917109828 is about 971.5692980794.

The spelling of 917109828 in words is "nine hundred seventeen million, one hundred nine thousand, eight hundred twenty-eight".