158861640 has 128 divisors (see below), whose sum is σ = 547200000. Its totient is φ = 36142848.

The previous prime is 158861579. The next prime is 158861669. The reversal of 158861640 is 46168851.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 318111 + ... + 318609.

It is an arithmetic number, because the mean of its divisors is an integer number (4275000).

Almost surely, 2^158861640 is an apocalyptic number.

158861640 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 158861640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273600000).

158861640 is an abundant number, since it is smaller than the sum of its proper divisors (388338360).

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

158861640 is a wasteful number, since it uses less digits than its factorization.

158861640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899 (or 895 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 158861640 is about 12604.0326879932. The cubic root of 158861640 is about 541.5929642784.

The spelling of 158861640 in words is "one hundred fifty-eight million, eight hundred sixty-one thousand, six hundred forty".