30691980 has 96 divisors (see below), whose sum is σ = 104186880. Its totient is φ = 7439040.

The previous prime is 30691979. The next prime is 30692003. The reversal of 30691980 is 8919603.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3357 + ... + 8523.

It is an arithmetic number, because the mean of its divisors is an integer number (1085280).

Almost surely, 2^30691980 is an apocalyptic number.

30691980 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 30691980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52093440).

30691980 is an abundant number, since it is smaller than the sum of its proper divisors (73494900).

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

30691980 is a wasteful number, since it uses less digits than its factorization.

30691980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5196 (or 5188 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 30691980 is about 5540.0342959227. The cubic root of 30691980 is about 313.0941613288.

The spelling of 30691980 in words is "thirty million, six hundred ninety-one thousand, nine hundred eighty".