64705623 has 4 divisors (see below), whose sum is σ = 86274168. Its totient is φ = 43137080.

The previous prime is 64705609. The next prime is 64705651. The reversal of 64705623 is 32650746.

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 64705623 - 2⁵ = 64705591 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64705603) 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, 10784268 + ... + 10784273.

It is an arithmetic number, because the mean of its divisors is an integer number (21568542).

Almost surely, 2^64705623 is an apocalyptic number.

64705623 is a deficient number, since it is larger than the sum of its proper divisors (21568545).

64705623 is a wasteful number, since it uses less digits than its factorization.

64705623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21568544.

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 64705623 is about 8043.9805444817. The cubic root of 64705623 is about 401.4646781652.

The spelling of 64705623 in words is "sixty-four million, seven hundred five thousand, six hundred twenty-three".