30668779638 has 72 divisors (see below), whose sum is σ = 77399560368. Its totient is φ = 8750978208.

The previous prime is 30668779621. The next prime is 30668779699. The reversal of 30668779638 is 83697786603.

It is a super-2 number, since 2×30668779638² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 659295 + ... + 704277.

It is an arithmetic number, because the mean of its divisors is an integer number (1074993894).

Almost surely, 2^30668779638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30668779638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38699780184).

30668779638 is an abundant number, since it is smaller than the sum of its proper divisors (46730780730).

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

30668779638 is a wasteful number, since it uses less digits than its factorization.

30668779638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45778 (or 45768 counting only the distinct ones).

The product of its (nonzero) digits is 54867456, while the sum is 63.

The spelling of 30668779638 in words is "thirty billion, six hundred sixty-eight million, seven hundred seventy-nine thousand, six hundred thirty-eight".