64133881 has 8 divisors (see below), whose sum is σ = 75083904. Its totient is φ = 53630880.

The previous prime is 64133879. The next prime is 64133887. The reversal of 64133881 is 18833146.

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

It is a cyclic number.

It is not a de Polignac number, because 64133881 - 2¹ = 64133879 is a prime.

It is a super-2 number, since 2×64133881² = 8226309384244322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64133887) 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, 111445 + ... + 112018.

It is an arithmetic number, because the mean of its divisors is an integer number (9385488).

Almost surely, 2^64133881 is an apocalyptic number.

It is an amenable number.

64133881 is a deficient number, since it is larger than the sum of its proper divisors (10950023).

64133881 is a wasteful number, since it uses less digits than its factorization.

64133881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223511.

The product of its digits is 13824, while the sum is 34.

The square root of 64133881 is about 8008.3631910647. The cubic root of 64133881 is about 400.2787244865.

The spelling of 64133881 in words is "sixty-four million, one hundred thirty-three thousand, eight hundred eighty-one".