30990090 has 32 divisors (see below), whose sum is σ = 76389120. Its totient is φ = 8040384.

The previous prime is 30990077. The next prime is 30990097. The reversal of 30990090 is 9009903.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (30990097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12850 + ... + 15069.

It is an arithmetic number, because the mean of its divisors is an integer number (2387160).

Almost surely, 2^30990090 is an apocalyptic number.

30990090 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

30990090 is an abundant number, since it is smaller than the sum of its proper divisors (45399030).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30990090 is a wasteful number, since it uses less digits than its factorization.

30990090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27966.

The product of its (nonzero) digits is 2187, while the sum is 30.

The square root of 30990090 is about 5566.8743474233. The cubic root of 30990090 is about 314.1045873895.

Adding to 30990090 its reverse (9009903), we get a palindrome (39999993).

The spelling of 30990090 in words is "thirty million, nine hundred ninety thousand, ninety".