30987890 has 8 divisors (see below), whose sum is σ = 55778220. Its totient is φ = 12395152.

The previous prime is 30987871. The next prime is 30987953. The reversal of 30987890 is 9878903.

It can be written as a sum of positive squares in 2 ways, for example, as 30459361 + 528529 = 5519^2 + 727^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between odd and even.

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, 1549385 + ... + 1549404.

Almost surely, 2^30987890 is an apocalyptic number.

30987890 is a deficient number, since it is larger than the sum of its proper divisors (24790330).

30987890 is a wasteful number, since it uses less digits than its factorization.

30987890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3098796.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 30987890 is about 5566.6767464979. The cubic root of 30987890 is about 314.0971544064.

The spelling of 30987890 in words is "thirty million, nine hundred eighty-seven thousand, eight hundred ninety".