720861646 has 8 divisors (see below), whose sum is σ = 1099619640. Its totient is φ = 354321768.

The previous prime is 720861629. The next prime is 720861677. The reversal of 720861646 is 646168027.

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

It is a junction number, because it is equal to n+sod(n) for n = 720861599 and 720861608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3054381 + ... + 3054616.

It is an arithmetic number, because the mean of its divisors is an integer number (137452455).

Almost surely, 2^720861646 is an apocalyptic number.

720861646 is a deficient number, since it is larger than the sum of its proper divisors (378757994).

720861646 is a wasteful number, since it uses less digits than its factorization.

720861646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6109058.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 720861646 is about 26848.8667544833. The cubic root of 720861646 is about 896.6383423811.

The spelling of 720861646 in words is "seven hundred twenty million, eight hundred sixty-one thousand, six hundred forty-six".