64881399 has 16 divisors (see below), whose sum is σ = 94627584. Its totient is φ = 39216000.

The previous prime is 64881391. The next prime is 64881403. The reversal of 64881399 is 99318846.

It is not a de Polignac number, because 64881399 - 2³ = 64881391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64881391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10782 + ... + 15684.

It is an arithmetic number, because the mean of its divisors is an integer number (5914224).

Almost surely, 2^64881399 is an apocalyptic number.

64881399 is a deficient number, since it is larger than the sum of its proper divisors (29746185).

64881399 is a wasteful number, since it uses less digits than its factorization.

64881399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5318.

The product of its digits is 373248, while the sum is 48.

The square root of 64881399 is about 8054.8990682690. The cubic root of 64881399 is about 401.8278823089.

It can be divided in two parts, 6488 and 1399, that added together give a palindrome (7887).

The spelling of 64881399 in words is "sixty-four million, eight hundred eighty-one thousand, three hundred ninety-nine".