1156028720 has 160 divisors (see below), whose sum is σ = 3402210816. Its totient is φ = 354816000.

The previous prime is 1156028707. The next prime is 1156028767. The reversal of 1156028720 is 278206511.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 411320 + ... + 414120.

Almost surely, 2^1156028720 is an apocalyptic number.

1156028720 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 1156028720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1701105408).

1156028720 is an abundant number, since it is smaller than the sum of its proper divisors (2246182096).

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

1156028720 is a wasteful number, since it uses less digits than its factorization.

1156028720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2899 (or 2893 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 1156028720 is about 34000.4223503179. The cubic root of 1156028720 is about 1049.5171536568.

The spelling of 1156028720 in words is "one billion, one hundred fifty-six million, twenty-eight thousand, seven hundred twenty".