64251667 has 4 divisors (see below), whose sum is σ = 64458576. Its totient is φ = 64044760.

The previous prime is 64251643. The next prime is 64251683. The reversal of 64251667 is 76615246.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 64251667 - 2¹⁵ = 64218899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64251367) 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, 102988 + ... + 103609.

It is an arithmetic number, because the mean of its divisors is an integer number (16114644).

Almost surely, 2^64251667 is an apocalyptic number.

64251667 is a deficient number, since it is larger than the sum of its proper divisors (206909).

64251667 is a wasteful number, since it uses less digits than its factorization.

64251667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206908.

The product of its digits is 60480, while the sum is 37.

The square root of 64251667 is about 8015.7137548692. The cubic root of 64251667 is about 400.5236205048.

The spelling of 64251667 in words is "sixty-four million, two hundred fifty-one thousand, six hundred sixty-seven".