30721334742 has 24 divisors (see below), whose sum is σ = 76071876816. Its totient is φ = 8777524176.

The previous prime is 30721334723. The next prime is 30721334827. The reversal of 30721334742 is 24743312703.

30721334742 is a `hidden beast` number, since 307 + 2 + 1 + 3 + 347 + 4 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 30721334697 and 30721334706.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121909933 + ... + 121910184.

It is an arithmetic number, because the mean of its divisors is an integer number (3169661534).

Almost surely, 2^30721334742 is an apocalyptic number.

30721334742 is an abundant number, since it is smaller than the sum of its proper divisors (45350542074).

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

30721334742 is a wasteful number, since it uses less digits than its factorization.

30721334742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243820132 (or 243820129 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 36.

The spelling of 30721334742 in words is "thirty billion, seven hundred twenty-one million, three hundred thirty-four thousand, seven hundred forty-two".