157909640 has 64 divisors (see below), whose sum is σ = 420076800. Its totient is φ = 52270848.

The previous prime is 157909639. The next prime is 157909679. The reversal of 157909640 is 46909751.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1604 + ... + 17843.

It is an arithmetic number, because the mean of its divisors is an integer number (6563700).

Almost surely, 2^157909640 is an apocalyptic number.

157909640 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 157909640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210038400).

157909640 is an abundant number, since it is smaller than the sum of its proper divisors (262167160).

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

157909640 is a wasteful number, since it uses less digits than its factorization.

157909640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19494 (or 19490 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 157909640 is about 12566.2102481217. The cubic root of 157909640 is about 540.5089394796.

The spelling of 157909640 in words is "one hundred fifty-seven million, nine hundred nine thousand, six hundred forty".