55220100 has 72 divisors (see below), whose sum is σ = 172072320. Its totient is φ = 13591680.

The previous prime is 55220069. The next prime is 55220101. The reversal of 55220100 is 102255.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 55220100.

It is not an unprimeable number, because it can be changed into a prime (55220101) 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, 3180 + ... + 10979.

Almost surely, 2^55220100 is an apocalyptic number.

55220100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55220100 is an abundant number, since it is smaller than the sum of its proper divisors (116852220).

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

55220100 is a wasteful number, since it uses less digits than its factorization.

55220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14189 (or 14182 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 55220100 is about 7431.0228098156. The cubic root of 55220100 is about 380.8018616915.

Adding to 55220100 its reverse (102255), we get a palindrome (55322355).

The spelling of 55220100 in words is "fifty-five million, two hundred twenty thousand, one hundred".