64481109 has 24 divisors (see below), whose sum is σ = 109106208. Its totient is φ = 33495840.

The previous prime is 64481101. The next prime is 64481111. The reversal of 64481109 is 90118446.

It is not a de Polignac number, because 64481109 - 2³ = 64481101 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a self number, because there is not a number n which added to its sum of digits gives 64481109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64481101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18322 + ... + 21555.

It is an arithmetic number, because the mean of its divisors is an integer number (4546092).

Almost surely, 2^64481109 is an apocalyptic number.

It is an amenable number.

64481109 is a deficient number, since it is larger than the sum of its proper divisors (44625099).

64481109 is a wasteful number, since it uses less digits than its factorization.

64481109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39905 (or 39898 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 64481109 is about 8030.0130136881. The cubic root of 64481109 is about 400.9998092880. Note that the first 3 decimals are identical.

It can be divided in two parts, 6448 and 1109, that added together give a palindrome (7557).

The spelling of 64481109 in words is "sixty-four million, four hundred eighty-one thousand, one hundred nine".