64750371840 has 1584 divisors, whose sum is σ = 297951494400. Its totient is φ = 13284311040.

The previous prime is 64750371839. The next prime is 64750371893. The reversal of 64750371840 is 4817305746.

64750371840 is a `hidden beast` number, since 64 + 7 + 503 + 7 + 1 + 84 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1584).

It is a super-2 number, since 2×64750371840² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 819624921 + ... + 819624999.

Almost surely, 2^64750371840 is an apocalyptic number.

64750371840 is a gapful number since it is divisible by the number (60) 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 64750371840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148975747200).

64750371840 is an abundant number, since it is smaller than the sum of its proper divisors (233201122560).

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

64750371840 is a wasteful number, since it uses less digits than its factorization.

64750371840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 64750371840 in words is "sixty-four billion, seven hundred fifty million, three hundred seventy-one thousand, eight hundred forty".