55223140 has 48 divisors (see below), whose sum is σ = 140337792. Its totient is φ = 17819136.

The previous prime is 55223107. The next prime is 55223143. The reversal of 55223140 is 4132255.

It is not an unprimeable number, because it can be changed into a prime (55223143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9222 + ... + 13981.

It is an arithmetic number, because the mean of its divisors is an integer number (2923704).

Almost surely, 2^55223140 is an apocalyptic number.

It is an amenable number.

55223140 is an abundant number, since it is smaller than the sum of its proper divisors (85114652).

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

55223140 is a wasteful number, since it uses less digits than its factorization.

55223140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23236 (or 23234 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 55223140 is about 7431.2273548856. The cubic root of 55223140 is about 380.8088495843.

Adding to 55223140 its reverse (4132255), we get a palindrome (59355395).

The spelling of 55223140 in words is "fifty-five million, two hundred twenty-three thousand, one hundred forty".