30990786 has 16 divisors (see below), whose sum is σ = 65244000. Its totient is φ = 9786528.

The previous prime is 30990781. The next prime is 30990797. The reversal of 30990786 is 68709903.

It is a happy number.

It is a super-3 number, since 3×30990786³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (30990781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135811 + ... + 136038.

It is an arithmetic number, because the mean of its divisors is an integer number (4077750).

Almost surely, 2^30990786 is an apocalyptic number.

30990786 is an abundant number, since it is smaller than the sum of its proper divisors (34253214).

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

30990786 is a wasteful number, since it uses less digits than its factorization.

30990786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271873.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 30990786 is about 5566.9368597102. The cubic root of 30990786 is about 314.1069388418.

The spelling of 30990786 in words is "thirty million, nine hundred ninety thousand, seven hundred eighty-six".