64813263 has 4 divisors (see below), whose sum is σ = 86417688. Its totient is φ = 43208840.

The previous prime is 64813261. The next prime is 64813303. The reversal of 64813263 is 36231846.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64813263 - 2¹ = 64813261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64813261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10802208 + ... + 10802213.

It is an arithmetic number, because the mean of its divisors is an integer number (21604422).

Almost surely, 2^64813263 is an apocalyptic number.

64813263 is a deficient number, since it is larger than the sum of its proper divisors (21604425).

64813263 is a wasteful number, since it uses less digits than its factorization.

64813263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21604424.

The product of its digits is 20736, while the sum is 33.

The square root of 64813263 is about 8050.6684815610. The cubic root of 64813263 is about 401.6871715417.

The spelling of 64813263 in words is "sixty-four million, eight hundred thirteen thousand, two hundred sixty-three".