645542712 has 48 divisors (see below), whose sum is σ = 1765675080. Its totient is φ = 213048000.

The previous prime is 645542707. The next prime is 645542713. The reversal of 645542712 is 217245546.

It is a happy number.

645542712 is a `hidden beast` number, since 6 + 45 + 542 + 71 + 2 = 666.

645542712 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645542713) 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, 37114 + ... + 51657.

Almost surely, 2^645542712 is an apocalyptic number.

It is an amenable number.

645542712 is an abundant number, since it is smaller than the sum of its proper divisors (1120132368).

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

645542712 is a wasteful number, since it uses less digits than its factorization.

645542712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88884 (or 88877 counting only the distinct ones).

The product of its digits is 67200, while the sum is 36.

The square root of 645542712 is about 25407.5325838618. The cubic root of 645542712 is about 864.2545224932.

The spelling of 645542712 in words is "six hundred forty-five million, five hundred forty-two thousand, seven hundred twelve".