123728090 has 8 divisors (see below), whose sum is σ = 222710580. Its totient is φ = 49491232.

The previous prime is 123728083. The next prime is 123728093. The reversal of 123728090 is 90827321.

It can be written as a sum of positive squares in 2 ways, for example, as 104182849 + 19545241 = 10207^2 + 4421^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (123728093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6186395 + ... + 6186414.

Almost surely, 2^123728090 is an apocalyptic number.

123728090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123728090 is a deficient number, since it is larger than the sum of its proper divisors (98982490).

123728090 is a wasteful number, since it uses less digits than its factorization.

123728090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12372816.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 123728090 is about 11123.3129057849. The cubic root of 123728090 is about 498.2983352440.

The spelling of 123728090 in words is "one hundred twenty-three million, seven hundred twenty-eight thousand, ninety".