55445040 has 320 divisors, whose sum is σ = 230937600. Its totient is φ = 11943936.

The previous prime is 55445023. The next prime is 55445051. The reversal of 55445040 is 4054455.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 55444995 and 55445013.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 287184 + ... + 287376.

It is an arithmetic number, because the mean of its divisors is an integer number (721680).

Almost surely, 2^55445040 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 55445040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115468800).

55445040 is an abundant number, since it is smaller than the sum of its proper divisors (175492560).

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

55445040 is a wasteful number, since it uses less digits than its factorization.

55445040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 27.

The square root of 55445040 is about 7446.1426255478. The cubic root of 55445040 is about 381.3182287637.

Adding to 55445040 its reverse (4054455), we get a palindrome (59499495).

The spelling of 55445040 in words is "fifty-five million, four hundred forty-five thousand, forty".