64442565 has 48 divisors (see below), whose sum is σ = 122630976. Its totient is φ = 31046400.

The previous prime is 64442561. The next prime is 64442633. The reversal of 64442565 is 56524446.

64442565 is a `hidden beast` number, since 644 + 4 + 2 + 5 + 6 + 5 = 666.

It is not a de Polignac number, because 64442565 - 2² = 64442561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64442561) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 104137 + ... + 104753.

It is an arithmetic number, because the mean of its divisors is an integer number (2554812).

Almost surely, 2^64442565 is an apocalyptic number.

It is an amenable number.

64442565 is a deficient number, since it is larger than the sum of its proper divisors (58188411).

64442565 is a wasteful number, since it uses less digits than its factorization.

64442565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850 (or 847 counting only the distinct ones).

The product of its digits is 115200, while the sum is 36.

The square root of 64442565 is about 8027.6126588171. The cubic root of 64442565 is about 400.9198932858.

It can be divided in two parts, 6444 and 2565, that added together give a palindrome (9009).

The spelling of 64442565 in words is "sixty-four million, four hundred forty-two thousand, five hundred sixty-five".