64997945 has 8 divisors (see below), whose sum is σ = 79657344. Its totient is φ = 50891824.

The previous prime is 64997927. The next prime is 64997951. The reversal of 64997945 is 54979946.

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 64997945 - 2¹² = 64993849 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138059 + ... + 138528.

It is an arithmetic number, because the mean of its divisors is an integer number (9957168).

Almost surely, 2^64997945 is an apocalyptic number.

It is an amenable number.

64997945 is a deficient number, since it is larger than the sum of its proper divisors (14659399).

64997945 is a wasteful number, since it uses less digits than its factorization.

64997945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276639.

The product of its digits is 2449440, while the sum is 53.

The square root of 64997945 is about 8062.1303016014. The cubic root of 64997945 is about 402.0683385879.

The spelling of 64997945 in words is "sixty-four million, nine hundred ninety-seven thousand, nine hundred forty-five".