645542726 has 8 divisors (see below), whose sum is σ = 1001704320. Its totient is φ = 311641288.

The previous prime is 645542713. The next prime is 645542731. The reversal of 645542726 is 627245546.

645542726 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 super-2 number, since 2×645542726² = 833450822183022152, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5564966 + ... + 5565081.

It is an arithmetic number, because the mean of its divisors is an integer number (125213040).

Almost surely, 2^645542726 is an apocalyptic number.

645542726 is a deficient number, since it is larger than the sum of its proper divisors (356161594).

645542726 is a wasteful number, since it uses less digits than its factorization.

645542726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11130078.

The product of its digits is 403200, while the sum is 41.

The square root of 645542726 is about 25407.5328593707. The cubic root of 645542726 is about 864.2545287410.

The spelling of 645542726 in words is "six hundred forty-five million, five hundred forty-two thousand, seven hundred twenty-six".