30987490 has 8 divisors (see below), whose sum is σ = 55777500. Its totient is φ = 12394992.

The previous prime is 30987443. The next prime is 30987493. The reversal of 30987490 is 9478903.

It can be written as a sum of positive squares in 2 ways, for example, as 30813601 + 173889 = 5551^2 + 417^2 .

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 not an unprimeable number, because it can be changed into a prime (30987493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1549365 + ... + 1549384.

Almost surely, 2^30987490 is an apocalyptic number.

30987490 is a deficient number, since it is larger than the sum of its proper divisors (24790010).

30987490 is a wasteful number, since it uses less digits than its factorization.

30987490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3098756.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 30987490 is about 5566.6408183033. The cubic root of 30987490 is about 314.0958029171.

The spelling of 30987490 in words is "thirty million, nine hundred eighty-seven thousand, four hundred ninety".