64135642 has 4 divisors (see below), whose sum is σ = 96203466. Its totient is φ = 32067820.

The previous prime is 64135639. The next prime is 64135657. The reversal of 64135642 is 24653146.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 50140561 + 13995081 = 7081^2 + 3741^2 .

It is a super-2 number, since 2×64135642² = 8226761149504328, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) 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 polite number, since it can be written as a sum of consecutive naturals, namely, 16033909 + ... + 16033912.

Almost surely, 2^64135642 is an apocalyptic number.

64135642 is a deficient number, since it is larger than the sum of its proper divisors (32067824).

64135642 is a wasteful number, since it uses less digits than its factorization.

64135642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32067823.

The product of its digits is 17280, while the sum is 31.

The square root of 64135642 is about 8008.4731378709. The cubic root of 64135642 is about 400.2823880955.

Adding to 64135642 its reverse (24653146), we get a palindrome (88788788).

The spelling of 64135642 in words is "sixty-four million, one hundred thirty-five thousand, six hundred forty-two".