645070573 has 8 divisors (see below), whose sum is σ = 748227392. Its totient is φ = 544664736.

The previous prime is 645070553. The next prime is 645070607. The reversal of 645070573 is 375070546.

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

It is not a de Polignac number, because 645070573 - 2⁹ = 645070061 is a prime.

It is a super-2 number, since 2×645070573² = 832232088301096658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645070513) 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, 687240 + ... + 688177.

It is an arithmetic number, because the mean of its divisors is an integer number (93528424).

Almost surely, 2^645070573 is an apocalyptic number.

It is an amenable number.

645070573 is a deficient number, since it is larger than the sum of its proper divisors (103156819).

645070573 is a wasteful number, since it uses less digits than its factorization.

645070573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375491.

The product of its (nonzero) digits is 88200, while the sum is 37.

The square root of 645070573 is about 25398.2395649777. The cubic root of 645070573 is about 864.0437707342.

The spelling of 645070573 in words is "six hundred forty-five million, seventy thousand, five hundred seventy-three".