30915990 has 96 divisors (see below), whose sum is σ = 94887936. Its totient is φ = 6834240.

The previous prime is 30915977. The next prime is 30916033. The reversal of 30915990 is 9951903.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18739 + ... + 20321.

It is an arithmetic number, because the mean of its divisors is an integer number (988416).

Almost surely, 2^30915990 is an apocalyptic number.

30915990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 30915990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47443968).

30915990 is an abundant number, since it is smaller than the sum of its proper divisors (63971946).

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

30915990 is a wasteful number, since it uses less digits than its factorization.

30915990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634 (or 1631 counting only the distinct ones).

The product of its (nonzero) digits is 10935, while the sum is 36.

The square root of 30915990 is about 5560.2149239036. The cubic root of 30915990 is about 313.8540371268.

The spelling of 30915990 in words is "thirty million, nine hundred fifteen thousand, nine hundred ninety".