64840018 has 8 divisors (see below), whose sum is σ = 97485948. Its totient is φ = 32344704.

The previous prime is 64840007. The next prime is 64840019. The reversal of 64840018 is 81004846.

It can be written as a sum of positive squares in 2 ways, for example, as 49182169 + 15657849 = 7013^2 + 3957^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (64840019) 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, 36571 + ... + 38302.

Almost surely, 2^64840018 is an apocalyptic number.

64840018 is a deficient number, since it is larger than the sum of its proper divisors (32645930).

64840018 is a wasteful number, since it uses less digits than its factorization.

64840018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75308.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 64840018 is about 8052.3299733680. The cubic root of 64840018 is about 401.7424362684.

The spelling of 64840018 in words is "sixty-four million, eight hundred forty thousand, eighteen".