64945973 has 4 divisors (see below), whose sum is σ = 64964448. Its totient is φ = 64927500.

The previous prime is 64945957. The next prime is 64945987. The reversal of 64945973 is 37954946.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 37954946 = 2 ⋅18977473.

It is a cyclic number.

It is not a de Polignac number, because 64945973 - 2⁴ = 64945957 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 (64945913) 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, 2153 + ... + 11598.

It is an arithmetic number, because the mean of its divisors is an integer number (16241112).

Almost surely, 2^64945973 is an apocalyptic number.

It is an amenable number.

64945973 is a deficient number, since it is larger than the sum of its proper divisors (18475).

64945973 is a wasteful number, since it uses less digits than its factorization.

64945973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18474.

The product of its digits is 816480, while the sum is 47.

The square root of 64945973 is about 8058.9064394619. The cubic root of 64945973 is about 401.9611461339.

The spelling of 64945973 in words is "sixty-four million, nine hundred forty-five thousand, nine hundred seventy-three".