646278567 has 16 divisors (see below), whose sum is σ = 940697472. Its totient is φ = 391410720.

The previous prime is 646278557. The next prime is 646278571. The reversal of 646278567 is 765872646.

It is not a de Polignac number, because 646278567 - 2⁴ = 646278551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646278557) 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, 47673 + ... + 59709.

It is an arithmetic number, because the mean of its divisors is an integer number (58793592).

Almost surely, 2^646278567 is an apocalyptic number.

646278567 is a deficient number, since it is larger than the sum of its proper divisors (294418905).

646278567 is a wasteful number, since it uses less digits than its factorization.

646278567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13678.

The product of its digits is 3386880, while the sum is 51.

The square root of 646278567 is about 25422.0094996442. The cubic root of 646278567 is about 864.5827860905.

The spelling of 646278567 in words is "six hundred forty-six million, two hundred seventy-eight thousand, five hundred sixty-seven".