64723540728 has 256 divisors, whose sum is σ = 210661171200. Its totient is φ = 16078487040.

The previous prime is 64723540727. The next prime is 64723540729. The reversal of 64723540728 is 82704532746.

It is an interprime number because it is at equal distance from previous prime (64723540727) and next prime (64723540729).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64723540723) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5728701 + ... + 5739987.

It is an arithmetic number, because the mean of its divisors is an integer number (822895200).

Almost surely, 2^64723540728 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 64723540728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105330585600).

64723540728 is an abundant number, since it is smaller than the sum of its proper divisors (145937630472).

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

64723540728 is a wasteful number, since it uses less digits than its factorization.

64723540728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11450 (or 11446 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 48.

The spelling of 64723540728 in words is "sixty-four billion, seven hundred twenty-three million, five hundred forty thousand, seven hundred twenty-eight".