156081640 has 96 divisors (see below), whose sum is σ = 415044000. Its totient is φ = 52366080.

The previous prime is 156081619. The next prime is 156081647. The reversal of 156081640 is 46180651.

It is a super-2 number, since 2×156081640² = 48722956690179200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (156081647) 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, 73311 + ... + 75409.

It is an arithmetic number, because the mean of its divisors is an integer number (4323375).

Almost surely, 2^156081640 is an apocalyptic number.

156081640 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 156081640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207522000).

156081640 is an abundant number, since it is smaller than the sum of its proper divisors (258962360).

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

156081640 is a wasteful number, since it uses less digits than its factorization.

156081640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2147 (or 2130 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 156081640 is about 12493.2637849363. The cubic root of 156081640 is about 538.4151519853.

The spelling of 156081640 in words is "one hundred fifty-six million, eighty-one thousand, six hundred forty".