64873993 has 4 divisors (see below), whose sum is σ = 65480400. Its totient is φ = 64267588.

The previous prime is 64873973. The next prime is 64874003. The reversal of 64873993 is 39937846.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64873993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64873903) 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, 303043 + ... + 303256.

It is an arithmetic number, because the mean of its divisors is an integer number (16370100).

Almost surely, 2^64873993 is an apocalyptic number.

It is an amenable number.

64873993 is a deficient number, since it is larger than the sum of its proper divisors (606407).

64873993 is a wasteful number, since it uses less digits than its factorization.

64873993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606406.

The product of its digits is 979776, while the sum is 49.

The square root of 64873993 is about 8054.4393349258. The cubic root of 64873993 is about 401.8125926133.

The spelling of 64873993 in words is "sixty-four million, eight hundred seventy-three thousand, nine hundred ninety-three".