156986640 has 80 divisors (see below), whose sum is σ = 540739200. Its totient is φ = 41862528.

The previous prime is 156986639. The next prime is 156986659. The reversal of 156986640 is 46689651.

156986640 is a `hidden beast` number, since 1 + 569 + 86 + 6 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (45).

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 15 ways as a sum of consecutive naturals, for example, 34180 + ... + 38499.

It is an arithmetic number, because the mean of its divisors is an integer number (6759240).

Almost surely, 2^156986640 is an apocalyptic number.

156986640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

156986640 is an abundant number, since it is smaller than the sum of its proper divisors (383752560).

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

156986640 is a wasteful number, since it uses less digits than its factorization.

156986640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72701 (or 72689 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 156986640 is about 12529.4309527608. The cubic root of 156986640 is about 539.4537686393.

It can be divided in two parts, 1569 and 86640, that added together give a square (88209 = 297²).

The spelling of 156986640 in words is "one hundred fifty-six million, nine hundred eighty-six thousand, six hundred forty".