30691680 has 96 divisors (see below), whose sum is σ = 98993664. Its totient is φ = 7988736.

The previous prime is 30691679. The next prime is 30691691. The reversal of 30691680 is 8619603.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19897 + ... + 21383.

It is an arithmetic number, because the mean of its divisors is an integer number (1031184).

Almost surely, 2^30691680 is an apocalyptic number.

30691680 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 30691680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49496832).

30691680 is an abundant number, since it is smaller than the sum of its proper divisors (68301984).

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

30691680 is a wasteful number, since it uses less digits than its factorization.

30691680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1548 (or 1540 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 30691680 is about 5540.0072202119. The cubic root of 30691680 is about 313.0931412083.

The spelling of 30691680 in words is "thirty million, six hundred ninety-one thousand, six hundred eighty".