64191399 has 8 divisors (see below), whose sum is σ = 86471280. Its totient is φ = 42352896.

The previous prime is 64191397. The next prime is 64191401. The reversal of 64191399 is 99319146.

It is an interprime number because it is at equal distance from previous prime (64191397) and next prime (64191401).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64191399 - 2¹ = 64191397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64191399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64191397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110004 + ... + 110585.

It is an arithmetic number, because the mean of its divisors is an integer number (10808910).

Almost surely, 2^64191399 is an apocalyptic number.

64191399 is a deficient number, since it is larger than the sum of its proper divisors (22279881).

64191399 is a wasteful number, since it uses less digits than its factorization.

64191399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220689.

The product of its digits is 52488, while the sum is 42.

The square root of 64191399 is about 8011.9535071042. The cubic root of 64191399 is about 400.3983510760.

The spelling of 64191399 in words is "sixty-four million, one hundred ninety-one thousand, three hundred ninety-nine".