55040216 has 64 divisors (see below), whose sum is σ = 129600000. Its totient is φ = 21288960.

The previous prime is 55040197. The next prime is 55040233. The reversal of 55040216 is 61204055.

It is a junction number, because it is equal to n+sod(n) for n = 55040191 and 55040200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122360 + ... + 122808.

It is an arithmetic number, because the mean of its divisors is an integer number (2025000).

Almost surely, 2^55040216 is an apocalyptic number.

55040216 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55040216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64800000).

55040216 is an abundant number, since it is smaller than the sum of its proper divisors (74559784).

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

55040216 is a wasteful number, since it uses less digits than its factorization.

55040216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672 (or 668 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 55040216 is about 7418.9093538067. The cubic root of 55040216 is about 380.3879141215.

The spelling of 55040216 in words is "fifty-five million, forty thousand, two hundred sixteen".