645341884 has 36 divisors (see below), whose sum is σ = 1243547872. Its totient is φ = 292818240.

The previous prime is 645341881. The next prime is 645341891. The reversal of 645341884 is 488143546.

It is a super-2 number, since 2×645341884² = 832932294489338912, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 645341884.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645341881) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 452797 + ... + 454219.

Almost surely, 2^645341884 is an apocalyptic number.

It is an amenable number.

645341884 is a deficient number, since it is larger than the sum of its proper divisors (598205988).

645341884 is a wasteful number, since it uses less digits than its factorization.

645341884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2386 (or 2373 counting only the distinct ones).

The product of its digits is 368640, while the sum is 43.

The square root of 645341884 is about 25403.5801413895. The cubic root of 645341884 is about 864.1648901545.

The spelling of 645341884 in words is "six hundred forty-five million, three hundred forty-one thousand, eight hundred eighty-four".