55198840 has 32 divisors (see below), whose sum is σ = 124523280. Its totient is φ = 22021632.

The previous prime is 55198777. The next prime is 55198841. The reversal of 55198840 is 4889155.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 55198793 and 55198802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55198841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15727 + ... + 18913.

Almost surely, 2^55198840 is an apocalyptic number.

It is an amenable number.

55198840 is an abundant number, since it is smaller than the sum of its proper divisors (69324440).

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

55198840 is a wasteful number, since it uses less digits than its factorization.

55198840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3631 (or 3627 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 55198840 is about 7429.5921826168. The cubic root of 55198840 is about 380.7529852450.

The spelling of 55198840 in words is "fifty-five million, one hundred ninety-eight thousand, eight hundred forty".