64403109 has 12 divisors (see below), whose sum is σ = 94782636. Its totient is φ = 42124992.

The previous prime is 64403081. The next prime is 64403117. The reversal of 64403109 is 90130446.

64403109 is a `hidden beast` number, since 644 + 0 + 3 + 10 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 48024900 + 16378209 = 6930^2 + 4047^2 .

It is not a de Polignac number, because 64403109 - 2¹⁷ = 64272037 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64403149) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67032 + ... + 67985.

It is an arithmetic number, because the mean of its divisors is an integer number (7898553).

Almost surely, 2^64403109 is an apocalyptic number.

It is an amenable number.

64403109 is a deficient number, since it is larger than the sum of its proper divisors (30379527).

64403109 is a wasteful number, since it uses less digits than its factorization.

64403109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135076 (or 135073 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 64403109 is about 8025.1547648628. The cubic root of 64403109 is about 400.8380533569.

The spelling of 64403109 in words is "sixty-four million, four hundred three thousand, one hundred nine".