64881969 has 8 divisors (see below), whose sum is σ = 88521312. Its totient is φ = 42248640.

The previous prime is 64881959. The next prime is 64881991. The reversal of 64881969 is 96918846.

It is a happy number.

64881969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 64881969 - 2⁴ = 64881953 is a prime.

It is a super-2 number, since 2×64881969² = 8419339802633922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64881959) 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 7 ways as a sum of consecutive naturals, for example, 251352 + ... + 251609.

It is an arithmetic number, because the mean of its divisors is an integer number (11065164).

Almost surely, 2^64881969 is an apocalyptic number.

It is an amenable number.

64881969 is a deficient number, since it is larger than the sum of its proper divisors (23639343).

64881969 is a wasteful number, since it uses less digits than its factorization.

64881969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503007.

The product of its digits is 746496, while the sum is 51.

The square root of 64881969 is about 8054.9344503851. The cubic root of 64881969 is about 401.8290590264.

The spelling of 64881969 in words is "sixty-four million, eight hundred eighty-one thousand, nine hundred sixty-nine".