30978190 has 16 divisors (see below), whose sum is σ = 55855728. Its totient is φ = 12370176.

The previous prime is 30978149. The next prime is 30978193. The reversal of 30978190 is 9187903.

It is a super-2 number, since 2×30978190² = 1919296511352200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30978193) 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, 4429 + ... + 9031.

It is an arithmetic number, because the mean of its divisors is an integer number (3490983).

Almost surely, 2^30978190 is an apocalyptic number.

30978190 is a deficient number, since it is larger than the sum of its proper divisors (24877538).

30978190 is a wasteful number, since it uses less digits than its factorization.

30978190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5283.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 30978190 is about 5565.8054223985. The cubic root of 30978190 is about 314.0643775124.

The spelling of 30978190 in words is "thirty million, nine hundred seventy-eight thousand, one hundred ninety".