64186864 has 120 divisors (see below), whose sum is σ = 158323200. Its totient is φ = 25038720.

The previous prime is 64186861. The next prime is 64186873. The reversal of 64186864 is 46868146.

It is a self number, because there is not a number n which added to its sum of digits gives 64186864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64186861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 461707 + ... + 461845.

It is an arithmetic number, because the mean of its divisors is an integer number (1319360).

Almost surely, 2^64186864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64186864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79161600).

64186864 is an abundant number, since it is smaller than the sum of its proper divisors (94136336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64186864 is a wasteful number, since it uses less digits than its factorization.

64186864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211 (or 198 counting only the distinct ones).

The product of its digits is 221184, while the sum is 43.

The square root of 64186864 is about 8011.6704874826. The cubic root of 64186864 is about 400.3889217272.

The spelling of 64186864 in words is "sixty-four million, one hundred eighty-six thousand, eight hundred sixty-four".