645645342 has 16 divisors (see below), whose sum is σ = 1298756880. Its totient is φ = 213970752.

The previous prime is 645645323. The next prime is 645645353. The reversal of 645645342 is 243546546.

It is a self number, because there is not a number n which added to its sum of digits gives 645645342.

It is a congruent number.

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, 309967 + ... + 312042.

It is an arithmetic number, because the mean of its divisors is an integer number (81172305).

Almost surely, 2^645645342 is an apocalyptic number.

645645342 is an abundant number, since it is smaller than the sum of its proper divisors (653111538).

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

645645342 is a wasteful number, since it uses less digits than its factorization.

645645342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622187.

The product of its digits is 345600, while the sum is 39.

The square root of 645645342 is about 25409.5521802333. The cubic root of 645645342 is about 864.3003205171.

The spelling of 645645342 in words is "six hundred forty-five million, six hundred forty-five thousand, three hundred forty-two".