720920091 has 8 divisors (see below), whose sum is σ = 961430544. Its totient is φ = 480511520.

The previous prime is 720920063. The next prime is 720920107. The reversal of 720920091 is 190029027.

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

It is a cyclic number.

It is not a de Polignac number, because 720920091 - 2⁷ = 720919963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (720920191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7056 + ... + 38621.

It is an arithmetic number, because the mean of its divisors is an integer number (120178818).

Almost surely, 2^720920091 is an apocalyptic number.

720920091 is a deficient number, since it is larger than the sum of its proper divisors (240510453).

720920091 is a wasteful number, since it uses less digits than its factorization.

720920091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50941.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 720920091 is about 26849.9551396273. The cubic root of 720920091 is about 896.6625738509.

The spelling of 720920091 in words is "seven hundred twenty million, nine hundred twenty thousand, ninety-one".