64431917 has 8 divisors (see below), whose sum is σ = 71253120. Its totient is φ = 57771360.

The previous prime is 64431893. The next prime is 64431929. The reversal of 64431917 is 71913446.

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 64431917 - 2¹⁶ = 64366381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64431937) 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, 39317 + ... + 40922.

It is an arithmetic number, because the mean of its divisors is an integer number (8906640).

Almost surely, 2^64431917 is an apocalyptic number.

It is an amenable number.

64431917 is a deficient number, since it is larger than the sum of its proper divisors (6821203).

64431917 is a wasteful number, since it uses less digits than its factorization.

64431917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80323.

The product of its digits is 18144, while the sum is 35.

The square root of 64431917 is about 8026.9494205458. The cubic root of 64431917 is about 400.8978104168.

The spelling of 64431917 in words is "sixty-four million, four hundred thirty-one thousand, nine hundred seventeen".