30721273664 has 28 divisors (see below), whose sum is σ = 61057714308. Its totient is φ = 15336652800.

The previous prime is 30721273663. The next prime is 30721273697. The reversal of 30721273664 is 46637212703.

It can be written as a sum of positive squares in 2 ways, for example, as 22837254400 + 7884019264 = 151120^2 + 88792^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30721273663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333407 + ... + 415454.

Almost surely, 2^30721273664 is an apocalyptic number.

It is an amenable number.

30721273664 is a deficient number, since it is larger than the sum of its proper divisors (30336440644).

30721273664 is an equidigital number, since it uses as much as digits as its factorization.

30721273664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749514 (or 749504 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 41.

The spelling of 30721273664 in words is "thirty billion, seven hundred twenty-one million, two hundred seventy-three thousand, six hundred sixty-four".