64262420660 has 72 divisors (see below), whose sum is σ = 143481413880. Its totient is φ = 24147518976.

The previous prime is 64262420653. The next prime is 64262420683. The reversal of 64262420660 is 6602426246.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 141039376 + 64121381284 = 11876^2 + 253222^2 .

It is a super-3 number, since 3×64262420660³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 753554 + ... + 834486.

It is an arithmetic number, because the mean of its divisors is an integer number (1992797415).

Almost surely, 2^64262420660 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 64262420660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71740706940).

64262420660 is an abundant number, since it is smaller than the sum of its proper divisors (79218993220).

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

64262420660 is a wasteful number, since it uses less digits than its factorization.

64262420660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81045 (or 81006 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 38.

The spelling of 64262420660 in words is "sixty-four billion, two hundred sixty-two million, four hundred twenty thousand, six hundred sixty".