55231660 has 72 divisors (see below), whose sum is σ = 132053040. Its totient is φ = 19367040.

The previous prime is 55231621. The next prime is 55231663. The reversal of 55231660 is 6613255.

It is not an unprimeable number, because it can be changed into a prime (55231663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69787 + ... + 70573.

It is an arithmetic number, because the mean of its divisors is an integer number (1834070).

Almost surely, 2^55231660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55231660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66026520).

55231660 is an abundant number, since it is smaller than the sum of its proper divisors (76821380).

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

55231660 is a wasteful number, since it uses less digits than its factorization.

55231660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847 (or 834 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 55231660 is about 7431.8005893592. The cubic root of 55231660 is about 380.8284327068.

The spelling of 55231660 in words is "fifty-five million, two hundred thirty-one thousand, six hundred sixty".