64640022 has 32 divisors (see below), whose sum is σ = 134313984. Its totient is φ = 20716800.

The previous prime is 64640021. The next prime is 64640041. The reversal of 64640022 is 22004646.

64640022 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 64639974 and 64640001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64640021) 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 15 ways as a sum of consecutive naturals, for example, 30022 + ... + 32102.

It is an arithmetic number, because the mean of its divisors is an integer number (4197312).

Almost surely, 2^64640022 is an apocalyptic number.

64640022 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

64640022 is an abundant number, since it is smaller than the sum of its proper divisors (69673962).

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

64640022 is a wasteful number, since it uses less digits than its factorization.

64640022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2284.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 64640022 is about 8039.9018650727. The cubic root of 64640022 is about 401.3289589471.

Adding to 64640022 its reverse (22004646), we get a palindrome (86644668).

The spelling of 64640022 in words is "sixty-four million, six hundred forty thousand, twenty-two".