64219685 has 4 divisors (see below), whose sum is σ = 77063628. Its totient is φ = 51375744.

The previous prime is 64219669. The next prime is 64219741. The reversal of 64219685 is 58691246.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 45131524 + 19088161 = 6718^2 + 4369^2 .

It is a cyclic number.

It is not a de Polignac number, because 64219685 - 2⁴ = 64219669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6421964 + ... + 6421973.

It is an arithmetic number, because the mean of its divisors is an integer number (19265907).

Almost surely, 2^64219685 is an apocalyptic number.

It is an amenable number.

64219685 is a deficient number, since it is larger than the sum of its proper divisors (12843943).

64219685 is a wasteful number, since it uses less digits than its factorization.

64219685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12843942.

The product of its digits is 103680, while the sum is 41.

The square root of 64219685 is about 8013.7185500865. The cubic root of 64219685 is about 400.4571544089.

The spelling of 64219685 in words is "sixty-four million, two hundred nineteen thousand, six hundred eighty-five".