64840267 has 4 divisors (see below), whose sum is σ = 64856880. Its totient is φ = 64823656.

The previous prime is 64840249. The next prime is 64840271. The reversal of 64840267 is 76204846.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64840267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64840247) 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, 1098 + ... + 11440.

It is an arithmetic number, because the mean of its divisors is an integer number (16214220).

Almost surely, 2^64840267 is an apocalyptic number.

64840267 is a deficient number, since it is larger than the sum of its proper divisors (16613).

64840267 is a wasteful number, since it uses less digits than its factorization.

64840267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16612.

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 64840267 is about 8052.3454347165. The cubic root of 64840267 is about 401.7429505277.

The spelling of 64840267 in words is "sixty-four million, eight hundred forty thousand, two hundred sixty-seven".