30865208720 has 40 divisors (see below), whose sum is σ = 72396689976. Its totient is φ = 12236822528.

The previous prime is 30865208681. The next prime is 30865208797. The reversal of 30865208720 is 2780256803.

It can be written as a sum of positive squares in 4 ways, for example, as 389825536 + 30475383184 = 19744^2 + 174572^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×30865208720² (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, 1698107 + ... + 1716186.

Almost surely, 2^30865208720 is an apocalyptic number.

It is an amenable number.

30865208720 is an abundant number, since it is smaller than the sum of its proper divisors (41531481256).

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

30865208720 is a wasteful number, since it uses less digits than its factorization.

30865208720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3414419 (or 3414413 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 41.

The spelling of 30865208720 in words is "thirty billion, eight hundred sixty-five million, two hundred eight thousand, seven hundred twenty".