1117565820 has 144 divisors (see below), whose sum is σ = 3883396608. Its totient is φ = 254839680.

The previous prime is 1117565777. The next prime is 1117565843. The reversal of 1117565820 is 285657111.

1117565820 is a `hidden beast` number, since 1 + 1 + 1 + 75 + 6 + 582 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 738865 + ... + 740375.

It is an arithmetic number, because the mean of its divisors is an integer number (26968032).

Almost surely, 2^1117565820 is an apocalyptic number.

1117565820 is a gapful number since it is divisible by the number (10) 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 1117565820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1941698304).

1117565820 is an abundant number, since it is smaller than the sum of its proper divisors (2765830788).

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

1117565820 is a wasteful number, since it uses less digits than its factorization.

1117565820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2120 (or 2115 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 36.

The square root of 1117565820 is about 33430.0137600929. The cubic root of 1117565820 is about 1037.7459255410.

The spelling of 1117565820 in words is "one billion, one hundred seventeen million, five hundred sixty-five thousand, eight hundred twenty".