64779002064 has 120 divisors (see below), whose sum is σ = 207439639680. Its totient is φ = 18485985024.

The previous prime is 64779002063. The next prime is 64779002077. The reversal of 64779002064 is 46020097746.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64779002063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 807414 + ... + 884010.

It is an arithmetic number, because the mean of its divisors is an integer number (1728663664).

Almost surely, 2^64779002064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64779002064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103719819840).

64779002064 is an abundant number, since it is smaller than the sum of its proper divisors (142660637616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64779002064 is a wasteful number, since it uses less digits than its factorization.

64779002064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77457 (or 77448 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 45.

The spelling of 64779002064 in words is "sixty-four billion, seven hundred seventy-nine million, two thousand, sixty-four".