64377767620 has 24 divisors (see below), whose sum is σ = 135201155544. Its totient is φ = 25749613056.

The previous prime is 64377767617. The next prime is 64377767627. The reversal of 64377767620 is 2676777346.

It can be written as a sum of positive squares in 4 ways, for example, as 44052132996 + 20325634624 = 209886^2 + 142568^2 .

It is not an unprimeable number, because it can be changed into a prime (64377767627) 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, 300492 + ... + 468028.

It is an arithmetic number, because the mean of its divisors is an integer number (5633381481).

Almost surely, 2^64377767620 is an apocalyptic number.

It is an amenable number.

64377767620 is an abundant number, since it is smaller than the sum of its proper divisors (70823387924).

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

64377767620 is a wasteful number, since it uses less digits than its factorization.

64377767620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186759 (or 186757 counting only the distinct ones).

The product of its (nonzero) digits is 12446784, while the sum is 55.

The spelling of 64377767620 in words is "sixty-four billion, three hundred seventy-seven million, seven hundred sixty-seven thousand, six hundred twenty".