30685872 has 80 divisors (see below), whose sum is σ = 91200512. Its totient is φ = 8709120.

The previous prime is 30685871. The next prime is 30685873. The reversal of 30685872 is 27858603.

It is an interprime number because it is at equal distance from previous prime (30685871) and next prime (30685873).

It is a self number, because there is not a number n which added to its sum of digits gives 30685872.

It is not an unprimeable number, because it can be changed into a prime (30685871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90888 + ... + 91224.

Almost surely, 2^30685872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30685872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45600256).

30685872 is an abundant number, since it is smaller than the sum of its proper divisors (60514640).

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

30685872 is a wasteful number, since it uses less digits than its factorization.

30685872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626 (or 620 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 30685872 is about 5539.4830083682. The cubic root of 30685872 is about 313.0733903650.

The spelling of 30685872 in words is "thirty million, six hundred eighty-five thousand, eight hundred seventy-two".