155956640 has 96 divisors (see below), whose sum is σ = 445906944. Its totient is φ = 50319360.

The previous prime is 155956631. The next prime is 155956663. The reversal of 155956640 is 46659551.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

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, 14945 + ... + 23135.

It is an arithmetic number, because the mean of its divisors is an integer number (4644864).

Almost surely, 2^155956640 is an apocalyptic number.

155956640 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 155956640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222953472).

155956640 is an abundant number, since it is smaller than the sum of its proper divisors (289950304).

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

155956640 is a wasteful number, since it uses less digits than its factorization.

155956640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8230 (or 8222 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 41.

The square root of 155956640 is about 12488.2600869777. The cubic root of 155956640 is about 538.2713813523.

The spelling of 155956640 in words is "one hundred fifty-five million, nine hundred fifty-six thousand, six hundred forty".