158961720 has 32 divisors (see below), whose sum is σ = 476885520. Its totient is φ = 42389760.

The previous prime is 158961701. The next prime is 158961827. The reversal of 158961720 is 27169851.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 662221 + ... + 662460.

Almost surely, 2^158961720 is an apocalyptic number.

158961720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

158961720 is an abundant number, since it is smaller than the sum of its proper divisors (317923800).

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

158961720 is a wasteful number, since it uses less digits than its factorization.

158961720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324695 (or 1324691 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 158961720 is about 12608.0022208120. The cubic root of 158961720 is about 541.7066717067.

The spelling of 158961720 in words is "one hundred fifty-eight million, nine hundred sixty-one thousand, seven hundred twenty".