645723367 has 8 divisors (see below), whose sum is σ = 697033440. Its totient is φ = 596349600.

The previous prime is 645723361. The next prime is 645723409. The reversal of 645723367 is 763327546.

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

It is a cyclic number.

It is not a de Polignac number, because 645723367 - 2²³ = 637334759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645723361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 483384 + ... + 484717.

It is an arithmetic number, because the mean of its divisors is an integer number (87129180).

Almost surely, 2^645723367 is an apocalyptic number.

645723367 is a deficient number, since it is larger than the sum of its proper divisors (51310073).

645723367 is a wasteful number, since it uses less digits than its factorization.

645723367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968153.

The product of its digits is 635040, while the sum is 43.

The square root of 645723367 is about 25411.0874816486. The cubic root of 645723367 is about 864.3351354595.

The spelling of 645723367 in words is "six hundred forty-five million, seven hundred twenty-three thousand, three hundred sixty-seven".