55099440 has 200 divisors, whose sum is σ = 209035728. Its totient is φ = 13340160.

The previous prime is 55099433. The next prime is 55099441. The reversal of 55099440 is 4499055.

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

It is a junction number, because it is equal to n+sod(n) for n = 55099395 and 55099404.

It is not an unprimeable number, because it can be changed into a prime (55099441) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 70894 + ... + 71666.

Almost surely, 2^55099440 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 55099440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104517864).

55099440 is an abundant number, since it is smaller than the sum of its proper divisors (153936288).

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

55099440 is a wasteful number, since it uses less digits than its factorization.

55099440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809 (or 794 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 55099440 is about 7422.8997029463. The cubic root of 55099440 is about 380.5242993571.

The spelling of 55099440 in words is "fifty-five million, ninety-nine thousand, four hundred forty".