647439038142 has 64 divisors (see below), whose sum is σ = 1416284002560. Its totient is φ = 196101886464.

The previous prime is 647439038111. The next prime is 647439038143. The reversal of 647439038142 is 241830934746.

It is a happy number.

It is a super-2 number, since 2×647439038142² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647439038143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7582278 + ... + 7667190.

It is an arithmetic number, because the mean of its divisors is an integer number (22129437540).

Almost surely, 2^647439038142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647439038142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (708142001280).

647439038142 is an abundant number, since it is smaller than the sum of its proper divisors (768844964418).

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

647439038142 is a wasteful number, since it uses less digits than its factorization.

647439038142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86457.

The product of its (nonzero) digits is 3483648, while the sum is 51.

The spelling of 647439038142 in words is "six hundred forty-seven billion, four hundred thirty-nine million, thirty-eight thousand, one hundred forty-two".