1156164220 has 96 divisors (see below), whose sum is σ = 2716471296. Its totient is φ = 411264000.

The previous prime is 1156164181. The next prime is 1156164221. The reversal of 1156164220 is 224616511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156164221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 451945 + ... + 454495.

It is an arithmetic number, because the mean of its divisors is an integer number (28296576).

Almost surely, 2^1156164220 is an apocalyptic number.

1156164220 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 1156164220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1358235648).

1156164220 is an abundant number, since it is smaller than the sum of its proper divisors (1560307076).

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

1156164220 is a wasteful number, since it uses less digits than its factorization.

1156164220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2651 (or 2649 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1156164220 is about 34002.4149142381. The cubic root of 1156164220 is about 1049.5581572570.

The spelling of 1156164220 in words is "one billion, one hundred fifty-six million, one hundred sixty-four thousand, two hundred twenty".