64947679 has 4 divisors (see below), whose sum is σ = 64964520. Its totient is φ = 64930840.

The previous prime is 64947677. The next prime is 64947683. The reversal of 64947679 is 97674946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97674946 = 2 ⋅48837473.

It is a cyclic number.

It is not a de Polignac number, because 64947679 - 2¹ = 64947677 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 (64947677) 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, 552 + ... + 11410.

It is an arithmetic number, because the mean of its divisors is an integer number (16241130).

Almost surely, 2^64947679 is an apocalyptic number.

64947679 is a deficient number, since it is larger than the sum of its proper divisors (16841).

64947679 is a wasteful number, since it uses less digits than its factorization.

64947679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16840.

The product of its digits is 2286144, while the sum is 52.

The square root of 64947679 is about 8059.0122843932. The cubic root of 64947679 is about 401.9646656732.

The spelling of 64947679 in words is "sixty-four million, nine hundred forty-seven thousand, six hundred seventy-nine".