64340247 has 4 divisors (see below), whose sum is σ = 85787000. Its totient is φ = 42893496.

The previous prime is 64340233. The next prime is 64340249. The reversal of 64340247 is 74204346.

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

It is not a de Polignac number, because 64340247 - 2⁴ = 64340231 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 (64340249) 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, 10723372 + ... + 10723377.

It is an arithmetic number, because the mean of its divisors is an integer number (21446750).

Almost surely, 2^64340247 is an apocalyptic number.

64340247 is a deficient number, since it is larger than the sum of its proper divisors (21446753).

64340247 is a wasteful number, since it uses less digits than its factorization.

64340247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21446752.

The product of its (nonzero) digits is 16128, while the sum is 30.

The square root of 64340247 is about 8021.2372487042. The cubic root of 64340247 is about 400.7075954503.

The spelling of 64340247 in words is "sixty-four million, three hundred forty thousand, two hundred forty-seven".