158691968 has 32 divisors (see below), whose sum is σ = 317848320. Its totient is φ = 78918400.

The previous prime is 158691947. The next prime is 158691983. The reversal of 158691968 is 869196851.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21203 + ... + 27693.

It is an arithmetic number, because the mean of its divisors is an integer number (9932760).

Almost surely, 2^158691968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 158691968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158924160).

158691968 is an abundant number, since it is smaller than the sum of its proper divisors (159156352).

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

158691968 is an equidigital number, since it uses as much as digits as its factorization.

158691968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6696 (or 6684 counting only the distinct ones).

The product of its digits is 933120, while the sum is 53.

The square root of 158691968 is about 12597.3000281806. The cubic root of 158691968 is about 541.4000796687.

The spelling of 158691968 in words is "one hundred fifty-eight million, six hundred ninety-one thousand, nine hundred sixty-eight".