647373684738 has 64 divisors (see below), whose sum is σ = 1456961915520. Its totient is φ = 190038182400.

The previous prime is 647373684707. The next prime is 647373684757. The reversal of 647373684738 is 837486373746.

It is a Harshad number since it is a multiple of its sum of digits (66).

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, 19603 + ... + 1138038.

It is an arithmetic number, because the mean of its divisors is an integer number (22765029930).

Almost surely, 2^647373684738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647373684738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (728480957760).

647373684738 is an abundant number, since it is smaller than the sum of its proper divisors (809588230782).

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

647373684738 is a wasteful number, since it uses less digits than its factorization.

647373684738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157923.

The product of its digits is 341397504, while the sum is 66.

The spelling of 647373684738 in words is "six hundred forty-seven billion, three hundred seventy-three million, six hundred eighty-four thousand, seven hundred thirty-eight".