645627242 has 16 divisors (see below), whose sum is σ = 1048185600. Its totient is φ = 296482032.

The previous prime is 645627223. The next prime is 645627251. The reversal of 645627242 is 242726546.

It is a happy number.

It is a super-2 number, since 2×645627242² = 833669071225053128, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645627196 and 645627205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57218 + ... + 67565.

It is an arithmetic number, because the mean of its divisors is an integer number (65511600).

Almost surely, 2^645627242 is an apocalyptic number.

645627242 is a deficient number, since it is larger than the sum of its proper divisors (402558358).

645627242 is a wasteful number, since it uses less digits than its factorization.

645627242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124997.

The product of its digits is 161280, while the sum is 38.

The square root of 645627242 is about 25409.1960124676. The cubic root of 645627242 is about 864.2922438528.

The spelling of 645627242 in words is "six hundred forty-five million, six hundred twenty-seven thousand, two hundred forty-two".