55239660 has 108 divisors (see below), whose sum is σ = 194948208. Its totient is φ = 12624192.

The previous prime is 55239659. The next prime is 55239661. The reversal of 55239660 is 6693255.

It is an interprime number because it is at equal distance from previous prime (55239659) and next prime (55239661).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (55239661) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5689 + ... + 11951.

It is an arithmetic number, because the mean of its divisors is an integer number (1805076).

Almost surely, 2^55239660 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 55239660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97474104).

55239660 is an abundant number, since it is smaller than the sum of its proper divisors (139708548).

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

55239660 is a wasteful number, since it uses less digits than its factorization.

55239660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6292 (or 6280 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The square root of 55239660 is about 7432.3387974446. The cubic root of 55239660 is about 380.8468187821.

The spelling of 55239660 in words is "fifty-five million, two hundred thirty-nine thousand, six hundred sixty".