64503320340 has 192 divisors, whose sum is σ = 186110410752. Its totient is φ = 16685760000.

The previous prime is 64503320291. The next prime is 64503320351. The reversal of 64503320340 is 4302330546.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 64503320298 and 64503320307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 168415789 + ... + 168416171.

It is an arithmetic number, because the mean of its divisors is an integer number (969325056).

Almost surely, 2^64503320340 is an apocalyptic number.

64503320340 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 64503320340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93055205376).

64503320340 is an abundant number, since it is smaller than the sum of its proper divisors (121607090412).

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

64503320340 is a wasteful number, since it uses less digits than its factorization.

64503320340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910 (or 908 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 30.

Adding to 64503320340 its reverse (4302330546), we get a palindrome (68805650886).

The spelling of 64503320340 in words is "sixty-four billion, five hundred three million, three hundred twenty thousand, three hundred forty".