64881933 has 4 divisors (see below), whose sum is σ = 86509248. Its totient is φ = 43254620.

The previous prime is 64881931. The next prime is 64881937. The reversal of 64881933 is 33918846.

It is a happy number.

64881933 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 64881933 - 2¹ = 64881931 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64881931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10813653 + ... + 10813658.

It is an arithmetic number, because the mean of its divisors is an integer number (21627312).

Almost surely, 2^64881933 is an apocalyptic number.

It is an amenable number.

64881933 is a deficient number, since it is larger than the sum of its proper divisors (21627315).

64881933 is a wasteful number, since it uses less digits than its factorization.

64881933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21627314.

The product of its digits is 124416, while the sum is 42.

The square root of 64881933 is about 8054.9322157297. The cubic root of 64881933 is about 401.8289847076.

The spelling of 64881933 in words is "sixty-four million, eight hundred eighty-one thousand, nine hundred thirty-three".