64537618 has 4 divisors (see below), whose sum is σ = 96806430. Its totient is φ = 32268808.

The previous prime is 64537601. The next prime is 64537639. The reversal of 64537618 is 81673546.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81673546 = 2 ⋅40836773.

It can be written as a sum of positive squares in only one way, i.e., 50452609 + 14085009 = 7103^2 + 3753^2 .

It is a super-2 number, since 2×64537618² = 8330208274227848, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16134403 + ... + 16134406.

Almost surely, 2^64537618 is an apocalyptic number.

64537618 is a deficient number, since it is larger than the sum of its proper divisors (32268812).

64537618 is a wasteful number, since it uses less digits than its factorization.

64537618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32268811.

The product of its digits is 120960, while the sum is 40.

The square root of 64537618 is about 8033.5308551097. The cubic root of 64537618 is about 401.1169158447.

The spelling of 64537618 in words is "sixty-four million, five hundred thirty-seven thousand, six hundred eighteen".