64256387 has 4 divisors (see below), whose sum is σ = 69199200. Its totient is φ = 59313576.

The previous prime is 64256371. The next prime is 64256429. The reversal of 64256387 is 78365246.

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: 78365246 = 2 ⋅39182623.

It is a cyclic number.

It is not a de Polignac number, because 64256387 - 2⁴ = 64256371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64256317) 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, 2471387 + ... + 2471412.

It is an arithmetic number, because the mean of its divisors is an integer number (17299800).

Almost surely, 2^64256387 is an apocalyptic number.

64256387 is a deficient number, since it is larger than the sum of its proper divisors (4942813).

64256387 is a wasteful number, since it uses less digits than its factorization.

64256387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4942812.

The product of its digits is 241920, while the sum is 41.

The square root of 64256387 is about 8016.0081711535. The cubic root of 64256387 is about 400.5334279038.

The spelling of 64256387 in words is "sixty-four million, two hundred fifty-six thousand, three hundred eighty-seven".