720347638 has 8 divisors (see below), whose sum is σ = 1098835560. Its totient is φ = 354069120.

The previous prime is 720347609. The next prime is 720347657. The reversal of 720347638 is 836743027.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 720347638.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3052203 + ... + 3052438.

It is an arithmetic number, because the mean of its divisors is an integer number (137354445).

Almost surely, 2^720347638 is an apocalyptic number.

720347638 is a deficient number, since it is larger than the sum of its proper divisors (378487922).

720347638 is a wasteful number, since it uses less digits than its factorization.

720347638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6104702.

The product of its (nonzero) digits is 169344, while the sum is 40.

The square root of 720347638 is about 26839.2927999230. The cubic root of 720347638 is about 896.4251767110.

The spelling of 720347638 in words is "seven hundred twenty million, three hundred forty-seven thousand, six hundred thirty-eight".