642702644628 has 96 divisors (see below), whose sum is σ = 1639889169408. Its totient is φ = 194292403200.

The previous prime is 642702644593. The next prime is 642702644707. The reversal of 642702644628 is 826446207246.

It is a congruent number.

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, 141344251 + ... + 141348797.

It is an arithmetic number, because the mean of its divisors is an integer number (17082178848).

Almost surely, 2^642702644628 is an apocalyptic number.

It is an amenable number.

642702644628 is an abundant number, since it is smaller than the sum of its proper divisors (997186524780).

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

642702644628 is a wasteful number, since it uses less digits than its factorization.

642702644628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6893 (or 6891 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 51.

The spelling of 642702644628 in words is "six hundred forty-two billion, seven hundred two million, six hundred forty-four thousand, six hundred twenty-eight".