720661852 has 24 divisors (see below), whose sum is σ = 1317206016. Its totient is φ = 344346288.

The previous prime is 720661847. The next prime is 720661891. The reversal of 720661852 is 258166027.

It is a happy number.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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, 119133 + ... + 125035.

It is an arithmetic number, because the mean of its divisors is an integer number (54883584).

Almost surely, 2^720661852 is an apocalyptic number.

It is an amenable number.

720661852 is a deficient number, since it is larger than the sum of its proper divisors (596544164).

720661852 is a wasteful number, since it uses less digits than its factorization.

720661852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7257 (or 7255 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 720661852 is about 26845.1457809415. The cubic root of 720661852 is about 896.5554973049. Note that the first 3 decimals are identical.

The spelling of 720661852 in words is "seven hundred twenty million, six hundred sixty-one thousand, eight hundred fifty-two".