645435754 has 16 divisors (see below), whose sum is σ = 985222656. Its totient is φ = 317041200.

The previous prime is 645435737. The next prime is 645435793. The reversal of 645435754 is 457534546.

It is a self number, because there is not a number n which added to its sum of digits gives 645435754.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115239 + ... + 120709.

It is an arithmetic number, because the mean of its divisors is an integer number (61576416).

Almost surely, 2^645435754 is an apocalyptic number.

645435754 is a deficient number, since it is larger than the sum of its proper divisors (339786902).

645435754 is a wasteful number, since it uses less digits than its factorization.

645435754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6501.

The product of its digits is 1008000, while the sum is 43.

The square root of 645435754 is about 25405.4276484376. The cubic root of 645435754 is about 864.2067879596.

The spelling of 645435754 in words is "six hundred forty-five million, four hundred thirty-five thousand, seven hundred fifty-four".