720661422 has 16 divisors (see below), whose sum is σ = 1552194000. Its totient is φ = 221741952.

The previous prime is 720661351. The next prime is 720661423. The reversal of 720661422 is 224166027.

It is a self number, because there is not a number n which added to its sum of digits gives 720661422.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720661423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4619547 + ... + 4619702.

It is an arithmetic number, because the mean of its divisors is an integer number (97012125).

Almost surely, 2^720661422 is an apocalyptic number.

720661422 is an abundant number, since it is smaller than the sum of its proper divisors (831532578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

720661422 is a wasteful number, since it uses less digits than its factorization.

720661422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9239267.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 720661422 is about 26845.1377720436. The cubic root of 720661422 is about 896.5553189878. Note that the first 3 decimals are identical.

The spelling of 720661422 in words is "seven hundred twenty million, six hundred sixty-one thousand, four hundred twenty-two".