64250328640 has 28 divisors (see below), whose sum is σ = 152996095836. Its totient is φ = 25700131328.

The previous prime is 64250328619. The next prime is 64250328661. The reversal of 64250328640 is 4682305246.

It is an interprime number because it is at equal distance from previous prime (64250328619) and next prime (64250328661).

It can be written as a sum of positive squares in 2 ways, for example, as 40590966784 + 23659361856 = 201472^2 + 153816^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 64250328593 and 64250328602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100390819 + ... + 100391458.

Almost surely, 2^64250328640 is an apocalyptic number.

It is an amenable number.

64250328640 is an abundant number, since it is smaller than the sum of its proper divisors (88745767196).

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

64250328640 is a wasteful number, since it uses less digits than its factorization.

64250328640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200782294 (or 200782284 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 40.

The spelling of 64250328640 in words is "sixty-four billion, two hundred fifty million, three hundred twenty-eight thousand, six hundred forty".