64509644 has 6 divisors (see below), whose sum is σ = 112891884. Its totient is φ = 32254820.

The previous prime is 64509629. The next prime is 64509647. The reversal of 64509644 is 44690546.

It is a happy number.

It is a super-2 number, since 2×64509644² = 8322988338013472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64509598 and 64509607.

It is not an unprimeable number, because it can be changed into a prime (64509647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8063702 + ... + 8063709.

It is an arithmetic number, because the mean of its divisors is an integer number (18815314).

Almost surely, 2^64509644 is an apocalyptic number.

It is an amenable number.

64509644 is a deficient number, since it is larger than the sum of its proper divisors (48382240).

64509644 is a wasteful number, since it uses less digits than its factorization.

64509644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16127415 (or 16127413 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 64509644 is about 8031.7895888774. The cubic root of 64509644 is about 401.0589524089.

The spelling of 64509644 in words is "sixty-four million, five hundred nine thousand, six hundred forty-four".