1156273664 has 240 divisors, whose sum is σ = 3019306752. Its totient is φ = 432267264.

The previous prime is 1156273661. The next prime is 1156273673. The reversal of 1156273664 is 4663726511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1156273661) 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, 13930967 + ... + 13931049.

Almost surely, 2^1156273664 is an apocalyptic number.

1156273664 is a gapful number since it is divisible by the number (14) 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 1156273664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1509653376).

1156273664 is an abundant number, since it is smaller than the sum of its proper divisors (1863033088).

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

1156273664 is an equidigital number, since it uses as much as digits as its factorization.

1156273664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157 (or 128 counting only the distinct ones).

The product of its digits is 181440, while the sum is 41.

The square root of 1156273664 is about 34004.0242324346. The cubic root of 1156273664 is about 1049.5912737228.

The spelling of 1156273664 in words is "one billion, one hundred fifty-six million, two hundred seventy-three thousand, six hundred sixty-four".