555390990 has 216 divisors, whose sum is σ = 1849767192. Its totient is φ = 114327360.

The previous prime is 555390989. The next prime is 555390991. The reversal of 555390990 is 99093555.

555390990 is a `hidden beast` number, since 5 + 553 + 9 + 0 + 9 + 90 = 666.

It is an interprime number because it is at equal distance from previous prime (555390989) and next prime (555390991).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (555390991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 5190517 + ... + 5190623.

It is an arithmetic number, because the mean of its divisors is an integer number (8563737).

Almost surely, 2^555390990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 555390990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (924883596).

555390990 is an abundant number, since it is smaller than the sum of its proper divisors (1294376202).

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

555390990 is a wasteful number, since it uses less digits than its factorization.

555390990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252 (or 135 counting only the distinct ones).

The product of its (nonzero) digits is 273375, while the sum is 45.

The square root of 555390990 is about 23566.7348183833. The cubic root of 555390990 is about 821.9895127154.

The spelling of 555390990 in words is "five hundred fifty-five million, three hundred ninety thousand, nine hundred ninety".