646232257 has 8 divisors (see below), whose sum is σ = 708009120. Its totient is φ = 584960160.

The previous prime is 646232227. The next prime is 646232263. The reversal of 646232257 is 752232646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646232257 - 2¹⁹ = 645707969 is a prime.

It is a super-2 number, since 2×646232257² = 835232259974628098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646232227) 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, 123507 + ... + 128632.

It is an arithmetic number, because the mean of its divisors is an integer number (88501140).

Almost surely, 2^646232257 is an apocalyptic number.

It is an amenable number.

646232257 is a deficient number, since it is larger than the sum of its proper divisors (61776863).

646232257 is a wasteful number, since it uses less digits than its factorization.

646232257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252383.

The product of its digits is 120960, while the sum is 37.

The square root of 646232257 is about 25421.0986583979. The cubic root of 646232257 is about 864.5621346319.

It can be divided in two parts, 646 and 232257, that added together give a triangular number (232903 = T₆₈₂).

The spelling of 646232257 in words is "six hundred forty-six million, two hundred thirty-two thousand, two hundred fifty-seven".