64399369 has 4 divisors (see below), whose sum is σ = 66476800. Its totient is φ = 62321940.

The previous prime is 64399331. The next prime is 64399381. The reversal of 64399369 is 96399346.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64399369 - 2¹¹ = 64397321 is a prime.

It is a super-3 number, since 3×64399369³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64399319) 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, 1038669 + ... + 1038730.

It is an arithmetic number, because the mean of its divisors is an integer number (16619200).

Almost surely, 2^64399369 is an apocalyptic number.

It is an amenable number.

64399369 is a deficient number, since it is larger than the sum of its proper divisors (2077431).

64399369 is a wasteful number, since it uses less digits than its factorization.

64399369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2077430.

The product of its digits is 944784, while the sum is 49.

The square root of 64399369 is about 8024.9217441667. The cubic root of 64399369 is about 400.8302940868.

The spelling of 64399369 in words is "sixty-four million, three hundred ninety-nine thousand, three hundred sixty-nine".