64746513888 has 192 divisors, whose sum is σ = 205913207808. Its totient is φ = 17389854720.

The previous prime is 64746513841. The next prime is 64746513899. The reversal of 64746513888 is 88831564746.

It is a super-2 number, since 2×64746513888² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11044078 + ... + 11049938.

It is an arithmetic number, because the mean of its divisors is an integer number (1072464624).

Almost surely, 2^64746513888 is an apocalyptic number.

64746513888 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64746513888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102956603904).

64746513888 is an abundant number, since it is smaller than the sum of its proper divisors (141166693920).

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

64746513888 is a wasteful number, since it uses less digits than its factorization.

64746513888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6865 (or 6857 counting only the distinct ones).

The product of its digits is 30965760, while the sum is 60.

The spelling of 64746513888 in words is "sixty-four billion, seven hundred forty-six million, five hundred thirteen thousand, eight hundred eighty-eight".