646425249 has 16 divisors (see below), whose sum is σ = 866580672. Its totient is φ = 428617728.

The previous prime is 646425193. The next prime is 646425271. The reversal of 646425249 is 942524646.

It is not a de Polignac number, because 646425249 - 2⁷ = 646425121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646425249.

It is not an unprimeable number, because it can be changed into a prime (646429249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 712254 + ... + 713160.

It is an arithmetic number, because the mean of its divisors is an integer number (54161292).

Almost surely, 2^646425249 is an apocalyptic number.

It is an amenable number.

646425249 is a deficient number, since it is larger than the sum of its proper divisors (220155423).

646425249 is a wasteful number, since it uses less digits than its factorization.

646425249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1936.

The product of its digits is 414720, while the sum is 42.

The square root of 646425249 is about 25424.8942770663. The cubic root of 646425249 is about 864.6481908790.

It can be divided in two parts, 6464 and 25249, that added together give a palindrome (31713).

The spelling of 646425249 in words is "six hundred forty-six million, four hundred twenty-five thousand, two hundred forty-nine".