645056572 has 12 divisors (see below), whose sum is σ = 1135156680. Its totient is φ = 320726096.

The previous prime is 645056563. The next prime is 645056579. The reversal of 645056572 is 275650546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645056579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 449743 + ... + 451174.

It is an arithmetic number, because the mean of its divisors is an integer number (94596390).

Almost surely, 2^645056572 is an apocalyptic number.

It is an amenable number.

645056572 is a deficient number, since it is larger than the sum of its proper divisors (490100108).

645056572 is a wasteful number, since it uses less digits than its factorization.

645056572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901100 (or 901098 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 40.

The square root of 645056572 is about 25397.9639341424. The cubic root of 645056572 is about 864.0375194469.

The spelling of 645056572 in words is "six hundred forty-five million, fifty-six thousand, five hundred seventy-two".