326556990 has 144 divisors (see below), whose sum is σ = 936870480. Its totient is φ = 78911712.

The previous prime is 326556983. The next prime is 326557001. The reversal of 326556990 is 99655623.

326556990 is a `hidden beast` number, since 3 + 2 + 6 + 556 + 9 + 90 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 14198119 + ... + 14198141.

It is an arithmetic number, because the mean of its divisors is an integer number (6506045).

Almost surely, 2^326556990 is an apocalyptic number.

326556990 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 326556990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (468435240).

326556990 is an abundant number, since it is smaller than the sum of its proper divisors (610313490).

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

326556990 is a wasteful number, since it uses less digits than its factorization.

326556990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116 (or 52 counting only the distinct ones).

The product of its (nonzero) digits is 437400, while the sum is 45.

The square root of 326556990 is about 18070.8879139903. The cubic root of 326556990 is about 688.6306174376.

The spelling of 326556990 in words is "three hundred twenty-six million, five hundred fifty-six thousand, nine hundred ninety".