100000000 has 81 divisors (see below), whose sum is σ = 249511591. Its totient is φ = 40000000.

The previous prime is 99999989. The next prime is 100000007. The reversal of 100000000 is 1.

It is a happy number.

The square root of 100000000 is 10000.

It is a perfect power (a square, a biquadrate, a 8-th power), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 71098624 + 28901376 = 8432^2 + 5376^2 .

It is a Harshad number since it is a multiple of its sum of digits (1).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (100000007) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 19999998 + ... + 20000002.

Almost surely, 2^100000000 is an apocalyptic number.

100000000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

100000000 is the 10000-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 100000000

100000000 is an abundant number, since it is smaller than the sum of its proper divisors (149511591).

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

100000000 is an frugal number, since it uses more digits than its factorization.

100000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56 (or 7 counting only the distinct ones).

The product of its (nonzero) digits is 1, while the sum is 1.

The cubic root of 100000000 is about 464.1588833613.

The spelling of 100000000 in words is "one hundred million", and thus it is an aban number.