156706640 has 20 divisors (see below), whose sum is σ = 364343124. Its totient is φ = 62682624.

The previous prime is 156706559. The next prime is 156706657. The reversal of 156706640 is 46607651.

It can be written as a sum of positive squares in 2 ways, for example, as 17372224 + 139334416 = 4168^2 + 11804^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 156706640.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 979337 + ... + 979496.

Almost surely, 2^156706640 is an apocalyptic number.

156706640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

156706640 is an abundant number, since it is smaller than the sum of its proper divisors (207636484).

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

156706640 is a wasteful number, since it uses less digits than its factorization.

156706640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1958846 (or 1958840 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 156706640 is about 12518.2522741795. The cubic root of 156706640 is about 539.1328560946.

The spelling of 156706640 in words is "one hundred fifty-six million, seven hundred six thousand, six hundred forty".