55191444 has 192 divisors, whose sum is σ = 174182400. Its totient is φ = 13453440.

The previous prime is 55191443. The next prime is 55191463. The reversal of 55191444 is 44419155.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55191443) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1041322 + ... + 1041374.

It is an arithmetic number, because the mean of its divisors is an integer number (907200).

Almost surely, 2^55191444 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 55191444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87091200).

55191444 is an abundant number, since it is smaller than the sum of its proper divisors (118990956).

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

55191444 is a wasteful number, since it uses less digits than its factorization.

55191444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 99 counting only the distinct ones).

The product of its digits is 14400, while the sum is 33.

The square root of 55191444 is about 7429.0944266445. The cubic root of 55191444 is about 380.7359790008.

The spelling of 55191444 in words is "fifty-five million, one hundred ninety-one thousand, four hundred forty-four".