123687090 has 24 divisors (see below), whose sum is σ = 321586668. Its totient is φ = 32983200.

The previous prime is 123687089. The next prime is 123687097. The reversal of 123687090 is 90786321.

It can be written as a sum of positive squares in 2 ways, for example, as 107308881 + 16378209 = 10359^2 + 4047^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (123687097) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 687061 + ... + 687240.

Almost surely, 2^123687090 is an apocalyptic number.

123687090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123687090 is an abundant number, since it is smaller than the sum of its proper divisors (197899578).

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

123687090 is a wasteful number, since it uses less digits than its factorization.

123687090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1374314 (or 1374311 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 123687090 is about 11121.4697769674. The cubic root of 123687090 is about 498.2432884910.

The spelling of 123687090 in words is "one hundred twenty-three million, six hundred eighty-seven thousand, ninety".