100000090 has 16 divisors (see below), whose sum is σ = 187826688. Its totient is φ = 38260816.

The previous prime is 100000081. The next prime is 100000123. The reversal of 100000090 is 90000001.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (10).

100000090 is a modest number, since divided by 90 gives 10 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217162 + ... + 217621.

It is an arithmetic number, because the mean of its divisors is an integer number (11739168).

Almost surely, 2^100000090 is an apocalyptic number.

100000090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

100000090 is a deficient number, since it is larger than the sum of its proper divisors (87826598).

100000090 is a wasteful number, since it uses less digits than its factorization.

100000090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434813.

The product of its (nonzero) digits is 9, while the sum is 10.

The square root of 100000090 is about 10000.0044999990. The cubic root of 100000090 is about 464.1590226089.

Adding to 100000090 its reverse (90000001), we get a palindrome (190000091).

The spelling of 100000090 in words is "one hundred million, ninety", and thus it is an aban number.