30990778 has 16 divisors (see below), whose sum is σ = 57214080. Its totient is φ = 12260016.

The previous prime is 30990769. The next prime is 30990781. The reversal of 30990778 is 87709903.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84958 + ... + 85321.

It is an arithmetic number, because the mean of its divisors is an integer number (3575880).

Almost surely, 2^30990778 is an apocalyptic number.

30990778 is a deficient number, since it is larger than the sum of its proper divisors (26223302).

30990778 is a wasteful number, since it uses less digits than its factorization.

30990778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170301.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 30990778 is about 5566.9361411821. The cubic root of 30990778 is about 314.1069118138.

The spelling of 30990778 in words is "thirty million, nine hundred ninety thousand, seven hundred seventy-eight".