645351786 has 40 divisors (see below), whose sum is σ = 1447516224. Its totient is φ = 214901640.

The previous prime is 645351781. The next prime is 645351787. The reversal of 645351786 is 687153546.

645351786 is a `hidden beast` number, since 6 + 4 + 53 + 517 + 86 = 666.

It is not an unprimeable number, because it can be changed into a prime (645351781) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 311791 + ... + 313853.

Almost surely, 2^645351786 is an apocalyptic number.

645351786 is an abundant number, since it is smaller than the sum of its proper divisors (802164438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645351786 is a wasteful number, since it uses less digits than its factorization.

645351786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4008 (or 3999 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 645351786 is about 25403.7750344314. The cubic root of 645351786 is about 864.1693099910.

The spelling of 645351786 in words is "six hundred forty-five million, three hundred fifty-one thousand, seven hundred eighty-six".