720664061 has 16 divisors (see below), whose sum is σ = 787046400. Its totient is φ = 655890048.

The previous prime is 720664027. The next prime is 720664079. The reversal of 720664061 is 160466027.

It is a cyclic number.

It is not a de Polignac number, because 720664061 - 2⁶ = 720663997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720664361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 562820 + ... + 564098.

It is an arithmetic number, because the mean of its divisors is an integer number (49190400).

Almost surely, 2^720664061 is an apocalyptic number.

It is an amenable number.

720664061 is a deficient number, since it is larger than the sum of its proper divisors (66382339).

720664061 is a wasteful number, since it uses less digits than its factorization.

720664061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1868.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 720664061 is about 26845.1869242887. The cubic root of 720664061 is about 896.5564133559.

The spelling of 720664061 in words is "seven hundred twenty million, six hundred sixty-four thousand, sixty-one".