30987776 has 40 divisors (see below), whose sum is σ = 64080720. Its totient is φ = 14952448.

The previous prime is 30987769. The next prime is 30987791. The reversal of 30987776 is 67778903.

It is a super-2 number, since 2×30987776² = 1920484522852352, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 30987776.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13805 + ... + 15891.

It is an arithmetic number, because the mean of its divisors is an integer number (1602018).

Almost surely, 2^30987776 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 30987776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32040360).

30987776 is an abundant number, since it is smaller than the sum of its proper divisors (33092944).

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

30987776 is an equidigital number, since it uses as much as digits as its factorization.

30987776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2134 (or 2118 counting only the distinct ones).

The product of its (nonzero) digits is 444528, while the sum is 47.

The square root of 30987776 is about 5566.6665069860. Note that the first 3 decimals coincide. The cubic root of 30987776 is about 314.0967692332.

The spelling of 30987776 in words is "thirty million, nine hundred eighty-seven thousand, seven hundred seventy-six".