646225374 has 16 divisors (see below), whose sum is σ = 1299149712. Its totient is φ = 214291968.

The previous prime is 646225339. The next prime is 646225379. The reversal of 646225374 is 473522646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646225379) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277869 + ... + 280184.

It is an arithmetic number, because the mean of its divisors is an integer number (81196857).

Almost surely, 2^646225374 is an apocalyptic number.

646225374 is an abundant number, since it is smaller than the sum of its proper divisors (652924338).

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

646225374 is a wasteful number, since it uses less digits than its factorization.

646225374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558251.

The product of its digits is 241920, while the sum is 39.

The square root of 646225374 is about 25420.9632783654. The cubic root of 646225374 is about 864.5590651460.

It can be divided in two parts, 64622 and 5374, that added together give a palindrome (69996).

The spelling of 646225374 in words is "six hundred forty-six million, two hundred twenty-five thousand, three hundred seventy-four".