156661740 has 144 divisors (see below), whose sum is σ = 503193600. Its totient is φ = 39371904.

The previous prime is 156661733. The next prime is 156661777. The reversal of 156661740 is 47166651.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 156661695 and 156661704.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 326821 + ... + 327299.

It is an arithmetic number, because the mean of its divisors is an integer number (3494400).

Almost surely, 2^156661740 is an apocalyptic number.

156661740 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 156661740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251596800).

156661740 is an abundant number, since it is smaller than the sum of its proper divisors (346531860).

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

156661740 is a wasteful number, since it uses less digits than its factorization.

156661740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596 (or 591 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 156661740 is about 12516.4587643630. The cubic root of 156661740 is about 539.0813599199.

The spelling of 156661740 in words is "one hundred fifty-six million, six hundred sixty-one thousand, seven hundred forty".