64690567 has 4 divisors (see below), whose sum is σ = 64713616. Its totient is φ = 64667520.

The previous prime is 64690547. The next prime is 64690597. The reversal of 64690567 is 76509646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76509646 = 2 ⋅38254823.

It is a cyclic number.

It is not a de Polignac number, because 64690567 - 2¹⁵ = 64657799 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 (64690547) 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, 6618 + ... + 13159.

It is an arithmetic number, because the mean of its divisors is an integer number (16178404).

Almost surely, 2^64690567 is an apocalyptic number.

64690567 is a deficient number, since it is larger than the sum of its proper divisors (23049).

64690567 is a wasteful number, since it uses less digits than its factorization.

64690567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23048.

The product of its (nonzero) digits is 272160, while the sum is 43.

The square root of 64690567 is about 8043.0446349626. The cubic root of 64690567 is about 401.4335375379.

The spelling of 64690567 in words is "sixty-four million, six hundred ninety thousand, five hundred sixty-seven".