64676181 has 4 divisors (see below), whose sum is σ = 86234912. Its totient is φ = 43117452.

The previous prime is 64676179. The next prime is 64676189. The reversal of 64676181 is 18167646.

It is a happy number.

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 not a de Polignac number, because 64676181 - 2¹ = 64676179 is a prime.

It is a super-2 number, since 2×64676181² = 8366016777489522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64676189) 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, 10779361 + ... + 10779366.

It is an arithmetic number, because the mean of its divisors is an integer number (21558728).

Almost surely, 2^64676181 is an apocalyptic number.

It is an amenable number.

64676181 is a deficient number, since it is larger than the sum of its proper divisors (21558731).

64676181 is a wasteful number, since it uses less digits than its factorization.

64676181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21558730.

The product of its digits is 48384, while the sum is 39.

The square root of 64676181 is about 8042.1502721598. The cubic root of 64676181 is about 401.4037781707.

The spelling of 64676181 in words is "sixty-four million, six hundred seventy-six thousand, one hundred eighty-one".