55353440 has 48 divisors (see below), whose sum is σ = 131280912. Its totient is φ = 22055424.

The previous prime is 55353439. The next prime is 55353469. The reversal of 55353440 is 4435355.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55022 + ... + 56018.

It is an arithmetic number, because the mean of its divisors is an integer number (2735019).

Almost surely, 2^55353440 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 55353440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65640456).

55353440 is an abundant number, since it is smaller than the sum of its proper divisors (75927472).

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

55353440 is a wasteful number, since it uses less digits than its factorization.

55353440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1359 (or 1351 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 29.

The square root of 55353440 is about 7439.9892473041. The cubic root of 55353440 is about 381.1081227888.

Adding to 55353440 its reverse (4435355), we get a palindrome (59788795).

The spelling of 55353440 in words is "fifty-five million, three hundred fifty-three thousand, four hundred forty".