30509990 has 16 divisors (see below), whose sum is σ = 62763552. Its totient is φ = 10460544.

The previous prime is 30509989. The next prime is 30510041. The reversal of 30509990 is 9990503.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 30509990.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 217859 + ... + 217998.

It is an arithmetic number, because the mean of its divisors is an integer number (3922722).

Almost surely, 2^30509990 is an apocalyptic number.

30509990 is an abundant number, since it is smaller than the sum of its proper divisors (32253562).

30509990 is a wasteful number, since it uses less digits than its factorization.

30509990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435871.

The product of its (nonzero) digits is 10935, while the sum is 35.

The square root of 30509990 is about 5523.5848866474. The cubic root of 30509990 is about 312.4740970530.

The spelling of 30509990 in words is "thirty million, five hundred nine thousand, nine hundred ninety".