64329577780 has 48 divisors (see below), whose sum is σ = 145582136784. Its totient is φ = 23736407040.

The previous prime is 64329577727. The next prime is 64329577831. The reversal of 64329577780 is 8777592346.

It can be written as a sum of positive squares in 8 ways, for example, as 91661476 + 64237916304 = 9574^2 + 253452^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 305320 + ... + 471040.

It is an arithmetic number, because the mean of its divisors is an integer number (3032961183).

Almost surely, 2^64329577780 is an apocalyptic number.

It is an amenable number.

64329577780 is an abundant number, since it is smaller than the sum of its proper divisors (81252559004).

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

64329577780 is a wasteful number, since it uses less digits than its factorization.

64329577780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167236 (or 167234 counting only the distinct ones).

The product of its (nonzero) digits is 17781120, while the sum is 58.

The spelling of 64329577780 in words is "sixty-four billion, three hundred twenty-nine million, five hundred seventy-seven thousand, seven hundred eighty".