55221264 has 120 divisors (see below), whose sum is σ = 183252160. Its totient is φ = 15769728.

The previous prime is 55221263. The next prime is 55221269. The reversal of 55221264 is 46212255.

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

It is not an unprimeable number, because it can be changed into a prime (55221263) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26202 + ... + 28230.

Almost surely, 2^55221264 is an apocalyptic number.

55221264 is a gapful number since it is divisible by the number (54) 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 55221264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91626080).

55221264 is an abundant number, since it is smaller than the sum of its proper divisors (128030896).

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

55221264 is a wasteful number, since it uses less digits than its factorization.

55221264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2059 (or 2041 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 55221264 is about 7431.1011297115. The cubic root of 55221264 is about 380.8045373491.

Subtracting from 55221264 its reverse (46212255), we obtain a palindrome (9009009).

It can be divided in two parts, 5522 and 1264, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 55221264 in words is "fifty-five million, two hundred twenty-one thousand, two hundred sixty-four".