720055642 has 4 divisors (see below), whose sum is σ = 1080083466. Its totient is φ = 360027820.

The previous prime is 720055619. The next prime is 720055663. The reversal of 720055642 is 246550027.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 691742601 + 28313041 = 26301^2 + 5321^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 as a sum of consecutive naturals, namely, 180013909 + ... + 180013912.

Almost surely, 2^720055642 is an apocalyptic number.

720055642 is a deficient number, since it is larger than the sum of its proper divisors (360027824).

720055642 is a wasteful number, since it uses less digits than its factorization.

720055642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360027823.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 720055642 is about 26833.8525374200. The cubic root of 720055642 is about 896.3040370799.

The spelling of 720055642 in words is "seven hundred twenty million, fifty-five thousand, six hundred forty-two".