64186690 has 16 divisors (see below), whose sum is σ = 117495360. Its totient is φ = 25239280.

The previous prime is 64186673. The next prime is 64186691. The reversal of 64186690 is 9668146.

64186690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×64186690³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (64186691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53806 + ... + 54985.

It is an arithmetic number, because the mean of its divisors is an integer number (7343460).

Almost surely, 2^64186690 is an apocalyptic number.

64186690 is a deficient number, since it is larger than the sum of its proper divisors (53308670).

64186690 is a wasteful number, since it uses less digits than its factorization.

64186690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108857.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 64186690 is about 8011.6596283167. The cubic root of 64186690 is about 400.3885599307.

The spelling of 64186690 in words is "sixty-four million, one hundred eighty-six thousand, six hundred ninety".