64979278739 has 8 divisors (see below), whose sum is σ = 65899088640. Its totient is φ = 64059597000.

The previous prime is 64979278729. The next prime is 64979278747. The reversal of 64979278739 is 93787297946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64979278739 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (71).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64979278729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1509464 + ... + 1551914.

It is an arithmetic number, because the mean of its divisors is an integer number (8237386080).

Almost surely, 2^64979278739 is an apocalyptic number.

64979278739 is a deficient number, since it is larger than the sum of its proper divisors (919809901).

64979278739 is a wasteful number, since it uses less digits than its factorization.

64979278739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64081.

The product of its digits is 288054144, while the sum is 71.

The spelling of 64979278739 in words is "sixty-four billion, nine hundred seventy-nine million, two hundred seventy-eight thousand, seven hundred thirty-nine".