9420720664 has 32 divisors (see below), whose sum is σ = 18389805120. Its totient is φ = 4520261376.

The previous prime is 9420720613. The next prime is 9420720671. The reversal of 9420720664 is 4660270249.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196384 + ... + 239599.

It is an arithmetic number, because the mean of its divisors is an integer number (574681410).

Almost surely, 2^9420720664 is an apocalyptic number.

It is an amenable number.

9420720664 is a deficient number, since it is larger than the sum of its proper divisors (8969084456).

9420720664 is a wasteful number, since it uses less digits than its factorization.

9420720664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436099 (or 436095 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 9420720664 is about 97060.3969907397. The cubic root of 9420720664 is about 2112.0038661880.

The spelling of 9420720664 in words is "nine billion, four hundred twenty million, seven hundred twenty thousand, six hundred sixty-four".