64426647 has 4 divisors (see below), whose sum is σ = 85902200. Its totient is φ = 42951096.

The previous prime is 64426627. The next prime is 64426667. The reversal of 64426647 is 74662446.

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

It is an interprime number because it is at equal distance from previous prime (64426627) and next prime (64426667).

It is not a de Polignac number, because 64426647 - 2⁸ = 64426391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64426627) 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, 10737772 + ... + 10737777.

It is an arithmetic number, because the mean of its divisors is an integer number (21475550).

Almost surely, 2^64426647 is an apocalyptic number.

64426647 is a deficient number, since it is larger than the sum of its proper divisors (21475553).

64426647 is a wasteful number, since it uses less digits than its factorization.

64426647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21475552.

The product of its digits is 193536, while the sum is 39.

The square root of 64426647 is about 8026.6211446660. The cubic root of 64426647 is about 400.8868800727.

The spelling of 64426647 in words is "sixty-four million, four hundred twenty-six thousand, six hundred forty-seven".