30724979720 has 32 divisors (see below), whose sum is σ = 69815680920. Its totient is φ = 12168307200.

The previous prime is 30724979683. The next prime is 30724979777. The reversal of 30724979720 is 2797942703.

It can be written as a sum of positive squares in 4 ways, for example, as 24560531524 + 6164448196 = 156718^2 + 78514^2 .

It is a super-2 number, since 2×30724979720² (a number of 22 digits) contains 22 as substring.

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, 3798557 + ... + 3806636.

Almost surely, 2^30724979720 is an apocalyptic number.

It is an amenable number.

30724979720 is an abundant number, since it is smaller than the sum of its proper divisors (39090701200).

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

30724979720 is a wasteful number, since it uses less digits than its factorization.

30724979720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7605305 (or 7605301 counting only the distinct ones).

The product of its (nonzero) digits is 1333584, while the sum is 50.

The spelling of 30724979720 in words is "thirty billion, seven hundred twenty-four million, nine hundred seventy-nine thousand, seven hundred twenty".