64142644 has 6 divisors (see below), whose sum is σ = 112249634. Its totient is φ = 32071320.

The previous prime is 64142641. The next prime is 64142647. The reversal of 64142644 is 44624146.

It is an interprime number because it is at equal distance from previous prime (64142641) and next prime (64142647).

It can be written as a sum of positive squares in only one way, i.e., 57942544 + 6200100 = 7612^2 + 2490^2 .

It is a super-2 number, since 2×64142644² = 8228557558621472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64142641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8017827 + ... + 8017834.

Almost surely, 2^64142644 is an apocalyptic number.

It is an amenable number.

64142644 is a deficient number, since it is larger than the sum of its proper divisors (48106990).

64142644 is a wasteful number, since it uses less digits than its factorization.

64142644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16035665 (or 16035663 counting only the distinct ones).

The product of its digits is 18432, while the sum is 31.

The square root of 64142644 is about 8008.9102879231. The cubic root of 64142644 is about 400.2969544905.

The spelling of 64142644 in words is "sixty-four million, one hundred forty-two thousand, six hundred forty-four".