645867263 has 8 divisors (see below), whose sum is σ = 654612480. Its totient is φ = 637179480.

The previous prime is 645867259. The next prime is 645867269. The reversal of 645867263 is 362768546.

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 645867263 - 2² = 645867259 is a prime.

It is a super-2 number, since 2×645867263² = 834289042830222338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645867269) 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, 8528 + ... + 36938.

It is an arithmetic number, because the mean of its divisors is an integer number (81826560).

Almost surely, 2^645867263 is an apocalyptic number.

645867263 is a deficient number, since it is larger than the sum of its proper divisors (8745217).

645867263 is a wasteful number, since it uses less digits than its factorization.

645867263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28717.

The product of its digits is 1451520, while the sum is 47.

The square root of 645867263 is about 25413.9186864206. The cubic root of 645867263 is about 864.3993348455.

The spelling of 645867263 in words is "six hundred forty-five million, eight hundred sixty-seven thousand, two hundred sixty-three".