720158991 has 8 divisors (see below), whose sum is σ = 960370560. Its totient is φ = 480026712.

The previous prime is 720158983. The next prime is 720158993. The reversal of 720158991 is 199851027.

720158991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 720158991 - 2³ = 720158983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720158993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6286 + ... + 38468.

It is an arithmetic number, because the mean of its divisors is an integer number (120046320).

Almost surely, 2^720158991 is an apocalyptic number.

720158991 is a deficient number, since it is larger than the sum of its proper divisors (240211569).

720158991 is a wasteful number, since it uses less digits than its factorization.

720158991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39645.

The product of its (nonzero) digits is 45360, while the sum is 42.

The square root of 720158991 is about 26835.7781888284. The cubic root of 720158991 is about 896.3469169580.

The spelling of 720158991 in words is "seven hundred twenty million, one hundred fifty-eight thousand, nine hundred ninety-one".