720212638 has 8 divisors (see below), whose sum is σ = 1084839840. Its totient is φ = 358599360.

The previous prime is 720212611. The next prime is 720212657. The reversal of 720212638 is 836212027.

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

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 3 ways as a sum of consecutive naturals, for example, 752883 + ... + 753838.

It is an arithmetic number, because the mean of its divisors is an integer number (135604980).

Almost surely, 2^720212638 is an apocalyptic number.

720212638 is a deficient number, since it is larger than the sum of its proper divisors (364627202).

720212638 is a wasteful number, since it uses less digits than its factorization.

720212638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1506962.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 720212638 is about 26836.7777126838. Note that the first 4 decimals coincide. The cubic root of 720212638 is about 896.3691736771.

The spelling of 720212638 in words is "seven hundred twenty million, two hundred twelve thousand, six hundred thirty-eight".