30928680 has 96 divisors (see below), whose sum is σ = 102477960. Its totient is φ = 8087040.

The previous prime is 30928663. The next prime is 30928693. The reversal of 30928680 is 8682903.

It can be written as a sum of positive squares in 4 ways, for example, as 29615364 + 1313316 = 5442^2 + 1146^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18270 + ... + 19890.

Almost surely, 2^30928680 is an apocalyptic number.

30928680 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30928680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51238980).

30928680 is an abundant number, since it is smaller than the sum of its proper divisors (71549280).

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

30928680 is a wasteful number, since it uses less digits than its factorization.

30928680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691 (or 1684 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 30928680 is about 5561.3559497662. The cubic root of 30928680 is about 313.8969735157.

The spelling of 30928680 in words is "thirty million, nine hundred twenty-eight thousand, six hundred eighty".