64836881 has 4 divisors (see below), whose sum is σ = 64853232. Its totient is φ = 64820532.

The previous prime is 64836869. The next prime is 64836883. The reversal of 64836881 is 18863846.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 64836881 - 2⁶ = 64836817 is a prime.

It is a super-2 number, since 2×64836881² = 8407642275616322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64836883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1970 + ... + 11556.

It is an arithmetic number, because the mean of its divisors is an integer number (16213308).

Almost surely, 2^64836881 is an apocalyptic number.

It is an amenable number.

64836881 is a deficient number, since it is larger than the sum of its proper divisors (16351).

64836881 is an equidigital number, since it uses as much as digits as its factorization.

64836881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16350.

The product of its digits is 221184, while the sum is 44.

The square root of 64836881 is about 8052.1351826705. The cubic root of 64836881 is about 401.7359573151.

The spelling of 64836881 in words is "sixty-four million, eight hundred thirty-six thousand, eight hundred eighty-one".