55708240 has 80 divisors (see below), whose sum is σ = 152847360. Its totient is φ = 18478080.

The previous prime is 55708229. The next prime is 55708283. The reversal of 55708240 is 4280755.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15756 + ... + 18964.

It is an arithmetic number, because the mean of its divisors is an integer number (1910592).

Almost surely, 2^55708240 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 55708240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76423680).

55708240 is an abundant number, since it is smaller than the sum of its proper divisors (97139120).

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

55708240 is a wasteful number, since it uses less digits than its factorization.

55708240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3260 (or 3254 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 55708240 is about 7463.7952812225. The cubic root of 55708240 is about 381.9206545545.

Adding to 55708240 its reverse (4280755), we get a palindrome (59988995).

The spelling of 55708240 in words is "fifty-five million, seven hundred eight thousand, two hundred forty".