30787220728 has 32 divisors (see below), whose sum is σ = 66678208560. Its totient is φ = 13171002880.

The previous prime is 30787220707. The next prime is 30787220731. The reversal of 30787220728 is 82702278703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10288351 + ... + 10291342.

Almost surely, 2^30787220728 is an apocalyptic number.

It is an amenable number.

30787220728 is an abundant number, since it is smaller than the sum of its proper divisors (35890987832).

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

30787220728 is a wasteful number, since it uses less digits than its factorization.

30787220728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20579727 (or 20579723 counting only the distinct ones).

The product of its (nonzero) digits is 526848, while the sum is 46.

The spelling of 30787220728 in words is "thirty billion, seven hundred eighty-seven million, two hundred twenty thousand, seven hundred twenty-eight".