55870290 has 192 divisors, whose sum is σ = 179262720. Its totient is φ = 12337920.

The previous prime is 55870273. The next prime is 55870291. The reversal of 55870290 is 9207855.

It is not an unprimeable number, because it can be changed into a prime (55870291) 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 95 ways as a sum of consecutive naturals, for example, 542379 + ... + 542481.

It is an arithmetic number, because the mean of its divisors is an integer number (933660).

Almost surely, 2^55870290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55870290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89631360).

55870290 is an abundant number, since it is smaller than the sum of its proper divisors (123392430).

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

55870290 is a wasteful number, since it uses less digits than its factorization.

55870290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 55870290 is about 7474.6431352942. The cubic root of 55870290 is about 382.2906197392.

The spelling of 55870290 in words is "fifty-five million, eight hundred seventy thousand, two hundred ninety".