64840463 has 4 divisors (see below), whose sum is σ = 64894368. Its totient is φ = 64786560.

The previous prime is 64840453. The next prime is 64840487. The reversal of 64840463 is 36404846.

It is a happy number.

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 64840463 - 2²⁴ = 48063247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64840453) 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, 25106 + ... + 27567.

It is an arithmetic number, because the mean of its divisors is an integer number (16223592).

Almost surely, 2^64840463 is an apocalyptic number.

64840463 is a deficient number, since it is larger than the sum of its proper divisors (53905).

64840463 is a wasteful number, since it uses less digits than its factorization.

64840463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53904.

The product of its (nonzero) digits is 55296, while the sum is 35.

The square root of 64840463 is about 8052.3576050744. The cubic root of 64840463 is about 401.7433553252.

The spelling of 64840463 in words is "sixty-four million, eight hundred forty thousand, four hundred sixty-three".