64256389 has 16 divisors (see below), whose sum is σ = 67568256. Its totient is φ = 61056000.

The previous prime is 64256371. The next prime is 64256429. The reversal of 64256389 is 98365246.

It is a cyclic number.

It is not a de Polignac number, because 64256389 - 2¹⁹ = 63732101 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 (64256989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 425464 + ... + 425614.

It is an arithmetic number, because the mean of its divisors is an integer number (4223016).

Almost surely, 2^64256389 is an apocalyptic number.

It is an amenable number.

64256389 is a deficient number, since it is larger than the sum of its proper divisors (3311867).

64256389 is a wasteful number, since it uses less digits than its factorization.

64256389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396.

The product of its digits is 311040, while the sum is 43.

The square root of 64256389 is about 8016.0082959039. The cubic root of 64256389 is about 400.5334320594.

The spelling of 64256389 in words is "sixty-four million, two hundred fifty-six thousand, three hundred eighty-nine".