100055550 has 72 divisors (see below), whose sum is σ = 288671256. Its totient is φ = 22868160.

The previous prime is 100055531. The next prime is 100055561. The reversal of 100055550 is 55550001.

It is a super-2 number, since 2×100055550² = 20022226171605000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 544 + ... + 14156.

It is an arithmetic number, because the mean of its divisors is an integer number (4009323).

Almost surely, 2^100055550 is an apocalyptic number.

100055550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 100055550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144335628).

100055550 is an abundant number, since it is smaller than the sum of its proper divisors (188615706).

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

100055550 is a wasteful number, since it uses less digits than its factorization.

100055550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13642 (or 13630 counting only the distinct ones).

The product of its (nonzero) digits is 625, while the sum is 21.

The square root of 100055550 is about 10002.7771143818. Note that the first 3 decimals coincide. The cubic root of 100055550 is about 464.2448142049.

The spelling of 100055550 in words is "one hundred million, fifty-five thousand, five hundred fifty".