720979155 has 48 divisors (see below), whose sum is σ = 1354263456. Its totient is φ = 352719360.

The previous prime is 720979141. The next prime is 720979157. The reversal of 720979155 is 551979027.

It is not a de Polignac number, because 720979155 - 2¹⁰ = 720978131 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 720979155.

It is not an unprimeable number, because it can be changed into a prime (720979157) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 91575 + ... + 99135.

It is an arithmetic number, because the mean of its divisors is an integer number (28213822).

Almost surely, 2^720979155 is an apocalyptic number.

720979155 is a deficient number, since it is larger than the sum of its proper divisors (633284301).

720979155 is a wasteful number, since it uses less digits than its factorization.

720979155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7748 (or 7745 counting only the distinct ones).

The product of its (nonzero) digits is 198450, while the sum is 45.

The square root of 720979155 is about 26851.0550072060. The cubic root of 720979155 is about 896.6870606295.

The spelling of 720979155 in words is "seven hundred twenty million, nine hundred seventy-nine thousand, one hundred fifty-five".