64422641 has 4 divisors (see below), whose sum is σ = 64442532. Its totient is φ = 64402752.

The previous prime is 64422629. The next prime is 64422697. The reversal of 64422641 is 14622446.

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: 14622446 = 2 ⋅7311223.

It can be written as a sum of positive squares in 2 ways, for example, as 32160241 + 32262400 = 5671^2 + 5680^2 .

It is a cyclic number.

It is not a de Polignac number, because 64422641 - 2¹⁸ = 64160497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64428641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3836 + ... + 11981.

It is an arithmetic number, because the mean of its divisors is an integer number (16110633).

Almost surely, 2^64422641 is an apocalyptic number.

It is an amenable number.

64422641 is a deficient number, since it is larger than the sum of its proper divisors (19891).

64422641 is a wasteful number, since it uses less digits than its factorization.

64422641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19890.

The product of its digits is 9216, while the sum is 29.

The square root of 64422641 is about 8026.3715961822. The cubic root of 64422641 is about 400.8785709532.

The spelling of 64422641 in words is "sixty-four million, four hundred twenty-two thousand, six hundred forty-one".