1228928100 has 36 divisors (see below), whose sum is σ = 3555699504. Its totient is φ = 327714080.

The previous prime is 1228928093. The next prime is 1228928149. The reversal of 1228928100 is 18298221.

It is a super-2 number, since 2×1228928100² = 3020528549939220000, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2047914 + ... + 2048513.

Almost surely, 2^1228928100 is an apocalyptic number.

1228928100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1228928100 is an abundant number, since it is smaller than the sum of its proper divisors (2326771404).

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

1228928100 is a wasteful number, since it uses less digits than its factorization.

1228928100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4096444 (or 4096437 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 1228928100 is about 35056.0708009326. The cubic root of 1228928100 is about 1071.1299386129.

The spelling of 1228928100 in words is "one billion, two hundred twenty-eight million, nine hundred twenty-eight thousand, one hundred".