158616640 has 168 divisors, whose sum is σ = 468538560. Its totient is φ = 50079744.

The previous prime is 158616599. The next prime is 158616641. The reversal of 158616640 is 46616851.

It is a self number, because there is not a number n which added to its sum of digits gives 158616640.

It is not an unprimeable number, because it can be changed into a prime (158616641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 378351 + ... + 378769.

It is an arithmetic number, because the mean of its divisors is an integer number (2788920).

Almost surely, 2^158616640 is an apocalyptic number.

158616640 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 158616640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234269280).

158616640 is an abundant number, since it is smaller than the sum of its proper divisors (309921920).

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

158616640 is a wasteful number, since it uses less digits than its factorization.

158616640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469 (or 446 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 158616640 is about 12594.3098262668. The cubic root of 158616640 is about 541.3144020709.

The spelling of 158616640 in words is "one hundred fifty-eight million, six hundred sixteen thousand, six hundred forty".