30996778 has 16 divisors (see below), whose sum is σ = 48677760. Its totient is φ = 14775376.

The previous prime is 30996773. The next prime is 30996781. The reversal of 30996778 is 87769903.

It is not an unprimeable number, because it can be changed into a prime (30996773) 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, 15576 + ... + 17452.

It is an arithmetic number, because the mean of its divisors is an integer number (3042360).

Almost surely, 2^30996778 is an apocalyptic number.

30996778 is a deficient number, since it is larger than the sum of its proper divisors (17680982).

30996778 is a wasteful number, since it uses less digits than its factorization.

30996778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2261.

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 30996778 is about 5567.4750111698. The cubic root of 30996778 is about 314.1271814981.

The spelling of 30996778 in words is "thirty million, nine hundred ninety-six thousand, seven hundred seventy-eight".