64391073 has 8 divisors (see below), whose sum is σ = 85895808. Its totient is φ = 42906864.

The previous prime is 64391071. The next prime is 64391077. The reversal of 64391073 is 37019346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64391073 - 2¹ = 64391071 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64391071) 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, 5115 + ... + 12447.

It is an arithmetic number, because the mean of its divisors is an integer number (10736976).

Almost surely, 2^64391073 is an apocalyptic number.

It is an amenable number.

64391073 is a deficient number, since it is larger than the sum of its proper divisors (21504735).

64391073 is a wasteful number, since it uses less digits than its factorization.

64391073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10263.

The product of its (nonzero) digits is 13608, while the sum is 33.

The square root of 64391073 is about 8024.4048377434. The cubic root of 64391073 is about 400.8130815428.

The spelling of 64391073 in words is "sixty-four million, three hundred ninety-one thousand, seventy-three".