1156765820 has 24 divisors (see below), whose sum is σ = 2776238304. Its totient is φ = 396605376.

The previous prime is 1156765807. The next prime is 1156765853. The reversal of 1156765820 is 285676511.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4131167 + ... + 4131446.

It is an arithmetic number, because the mean of its divisors is an integer number (115676596).

Almost surely, 2^1156765820 is an apocalyptic number.

1156765820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1156765820 is an abundant number, since it is smaller than the sum of its proper divisors (1619472484).

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

1156765820 is a wasteful number, since it uses less digits than its factorization.

1156765820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8262629 (or 8262627 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 41.

The square root of 1156765820 is about 34011.2601942357. The cubic root of 1156765820 is about 1049.7401685120.

The spelling of 1156765820 in words is "one billion, one hundred fifty-six million, seven hundred sixty-five thousand, eight hundred twenty".