64247421904 has 40 divisors (see below), whose sum is σ = 131818882248. Its totient is φ = 30230138880.

The previous prime is 64247421863. The next prime is 64247421941. The reversal of 64247421904 is 40912474246.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13689000000 + 50558421904 = 117000^2 + 224852^2 .

It is a congruent number.

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, 3918684 + ... + 3935044.

Almost surely, 2^64247421904 is an apocalyptic number.

It is an amenable number.

64247421904 is an abundant number, since it is smaller than the sum of its proper divisors (67571460344).

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

64247421904 is a wasteful number, since it uses less digits than its factorization.

64247421904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30823 (or 30817 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 43.

The spelling of 64247421904 in words is "sixty-four billion, two hundred forty-seven million, four hundred twenty-one thousand, nine hundred four".