64423397 has 4 divisors (see below), whose sum is σ = 64690956. Its totient is φ = 64155840.

The previous prime is 64423393. The next prime is 64423399. The reversal of 64423397 is 79332446.

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

It can be written as a sum of positive squares in 2 ways, for example, as 29008996 + 35414401 = 5386^2 + 5951^2 .

It is a cyclic number.

It is not a de Polignac number, because 64423397 - 2² = 64423393 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64423397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64423393) 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, 133418 + ... + 133899.

It is an arithmetic number, because the mean of its divisors is an integer number (16172739).

Almost surely, 2^64423397 is an apocalyptic number.

It is an amenable number.

64423397 is a deficient number, since it is larger than the sum of its proper divisors (267559).

64423397 is a wasteful number, since it uses less digits than its factorization.

64423397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267558.

The product of its digits is 108864, while the sum is 38.

The square root of 64423397 is about 8026.4186907985. The cubic root of 64423397 is about 400.8801390511.

The spelling of 64423397 in words is "sixty-four million, four hundred twenty-three thousand, three hundred ninety-seven".