64321403355440 has 160 divisors (see below), whose sum is σ = 186467865578496. Its totient is φ = 20046151111680.

The previous prime is 64321403355431. The next prime is 64321403355463. The reversal of 64321403355440 is 4455330412346.

It is a super-2 number, since 2×64321403355440² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 64321403355391 and 64321403355400.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59418869 + ... + 60491691.

Almost surely, 2^{64321403355440} 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 64321403355440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93233932789248).

64321403355440 is an abundant number, since it is smaller than the sum of its proper divisors (122146462223056).

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

64321403355440 is a wasteful number, since it uses less digits than its factorization.

64321403355440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1082587 (or 1082581 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 44.

Adding to 64321403355440 its reverse (4455330412346), we get a palindrome (68776733767786).

The spelling of 64321403355440 in words is "sixty-four trillion, three hundred twenty-one billion, four hundred three million, three hundred fifty-five thousand, four hundred forty".