64220923788 has 24 divisors (see below), whose sum is σ = 171255796992. Its totient is φ = 18348835344.

The previous prime is 64220923733. The next prime is 64220923801. The reversal of 64220923788 is 88732902246.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 64220923788.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 382267320 + ... + 382267487.

It is an arithmetic number, because the mean of its divisors is an integer number (7135658208).

Almost surely, 2^64220923788 is an apocalyptic number.

It is an amenable number.

64220923788 is an abundant number, since it is smaller than the sum of its proper divisors (107034873204).

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

64220923788 is a wasteful number, since it uses less digits than its factorization.

64220923788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764534821 (or 764534819 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 51.

The spelling of 64220923788 in words is "sixty-four billion, two hundred twenty million, nine hundred twenty-three thousand, seven hundred eighty-eight".