64820679 has 24 divisors (see below), whose sum is σ = 109680768. Its totient is φ = 33672240.

The previous prime is 64820671. The next prime is 64820729. The reversal of 64820679 is 97602846.

It is not a de Polignac number, because 64820679 - 2³ = 64820671 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64820679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64820671) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18427 + ... + 21660.

It is an arithmetic number, because the mean of its divisors is an integer number (4570032).

Almost surely, 2^64820679 is an apocalyptic number.

64820679 is a deficient number, since it is larger than the sum of its proper divisors (44860089).

64820679 is a wasteful number, since it uses less digits than its factorization.

64820679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40115 (or 40108 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 64820679 is about 8051.1290512573. The cubic root of 64820679 is about 401.7024914434.

The spelling of 64820679 in words is "sixty-four million, eight hundred twenty thousand, six hundred seventy-nine".