64398979 has 4 divisors (see below), whose sum is σ = 65062984. Its totient is φ = 63734976.

The previous prime is 64398973. The next prime is 64398989. The reversal of 64398979 is 97989346.

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 64398979 - 2⁵ = 64398947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64398973) 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, 331857 + ... + 332050.

It is an arithmetic number, because the mean of its divisors is an integer number (16265746).

Almost surely, 2^64398979 is an apocalyptic number.

64398979 is a deficient number, since it is larger than the sum of its proper divisors (664005).

64398979 is an equidigital number, since it uses as much as digits as its factorization.

64398979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664004.

The product of its digits is 2939328, while the sum is 55.

The square root of 64398979 is about 8024.8974448276. The cubic root of 64398979 is about 400.8294849478.

The spelling of 64398979 in words is "sixty-four million, three hundred ninety-eight thousand, nine hundred seventy-nine".