55681290 has 128 divisors (see below), whose sum is σ = 179781120. Its totient is φ = 11971584.

The previous prime is 55681279. The next prime is 55681303. The reversal of 55681290 is 9218655.

It is a happy number.

55681290 is a `hidden beast` number, since 5 + 568 + 1 + 2 + 90 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 31264 + ... + 32996.

It is an arithmetic number, because the mean of its divisors is an integer number (1404540).

Almost surely, 2^55681290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55681290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89890560).

55681290 is an abundant number, since it is smaller than the sum of its proper divisors (124099830).

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

55681290 is a wasteful number, since it uses less digits than its factorization.

55681290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1773 (or 1767 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 55681290 is about 7461.9896810435. The cubic root of 55681290 is about 381.8590573122.

The spelling of 55681290 in words is "fifty-five million, six hundred eighty-one thousand, two hundred ninety".