It is a happy number.
55901790 is a `hidden beast` number, since 559 + 0 + 17 + 90 = 666.
It is a congruent number.
It is an unprimeable number.
Almost surely, 255901790 is an apocalyptic number.
It is a practical number, because each smaller number is the sum of distinct divisors of 55901790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84071520).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
55901790 is a wasteful number, since it uses less digits than its factorization.
55901790 is an odious number, because the sum of its binary digits is odd.
The square root of 55901790 is about 7476.7499623834. The cubic root of 55901790 is about 382.3624521454.
The spelling of 55901790 in words is "fifty-five million, nine hundred one thousand, seven hundred ninety".