723664651 has 8 divisors (see below), whose sum is σ = 747521408. Its totient is φ = 699840000.

The previous prime is 723664583. The next prime is 723664657. The reversal of 723664651 is 156466327.

723664651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a 9-Lehmer number, since φ(723664651) divides (723664651-1)⁹.

It is a cyclic number.

It is not a de Polignac number, because 723664651 - 2²⁵ = 690110219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (723664657) 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, 43051 + ... + 57451.

It is an arithmetic number, because the mean of its divisors is an integer number (93440176).

Almost surely, 2^723664651 is an apocalyptic number.

723664651 is the 12031-st centered decagonal number.

723664651 is a deficient number, since it is larger than the sum of its proper divisors (23856757).

723664651 is a wasteful number, since it uses less digits than its factorization.

723664651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16053.

The product of its digits is 181440, while the sum is 40.

The square root of 723664651 is about 26901.0157986646. The cubic root of 723664651 is about 897.7990048715.

The spelling of 723664651 in words is "seven hundred twenty-three million, six hundred sixty-four thousand, six hundred fifty-one".