68772544638 has 16 divisors (see below), whose sum is σ = 157194387840. Its totient is φ = 19649298456.

The previous prime is 68772544637. The next prime is 68772544661. The reversal of 68772544638 is 83644527786.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68772544637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 818720728 + ... + 818720811.

It is an arithmetic number, because the mean of its divisors is an integer number (9824649240).

Almost surely, 2^68772544638 is an apocalyptic number.

68772544638 is an abundant number, since it is smaller than the sum of its proper divisors (88421843202).

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

68772544638 is a wasteful number, since it uses less digits than its factorization.

68772544638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1637441551.

The product of its digits is 54190080, while the sum is 60.

The spelling of 68772544638 in words is "sixty-eight billion, seven hundred seventy-two million, five hundred forty-four thousand, six hundred thirty-eight".