64961979 has 4 divisors (see below), whose sum is σ = 86615976. Its totient is φ = 43307984.

The previous prime is 64961977. The next prime is 64961987. The reversal of 64961979 is 97916946.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64961979 - 2¹ = 64961977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64961977) 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, 10826994 + ... + 10826999.

It is an arithmetic number, because the mean of its divisors is an integer number (21653994).

Almost surely, 2^64961979 is an apocalyptic number.

64961979 is a deficient number, since it is larger than the sum of its proper divisors (21653997).

64961979 is a wasteful number, since it uses less digits than its factorization.

64961979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21653996.

The product of its digits is 734832, while the sum is 51.

The square root of 64961979 is about 8059.8994410600. The cubic root of 64961979 is about 401.9941646637.

The spelling of 64961979 in words is "sixty-four million, nine hundred sixty-one thousand, nine hundred seventy-nine".