64699399 has 8 divisors (see below), whose sum is σ = 68586480. Its totient is φ = 60821376.

The previous prime is 64699363. The next prime is 64699409. The reversal of 64699399 is 99399646.

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

It is not a de Polignac number, because 64699399 - 2²¹ = 62602247 is a prime.

It is a super-2 number, since 2×64699399² = 8372024461922402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64699099) 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, 17397 + ... + 20785.

It is an arithmetic number, because the mean of its divisors is an integer number (8573310).

Almost surely, 2^64699399 is an apocalyptic number.

64699399 is a deficient number, since it is larger than the sum of its proper divisors (3887081).

64699399 is a wasteful number, since it uses less digits than its factorization.

64699399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4529.

The product of its digits is 2834352, while the sum is 55.

The square root of 64699399 is about 8043.5936620394. The cubic root of 64699399 is about 401.4518055267.

The spelling of 64699399 in words is "sixty-four million, six hundred ninety-nine thousand, three hundred ninety-nine".