129728290 has 16 divisors (see below), whose sum is σ = 239822712. Its totient is φ = 50488704.

The previous prime is 129728279. The next prime is 129728317. The reversal of 129728290 is 92827921.

It can be written as a sum of positive squares in 4 ways, for example, as 129345129 + 383161 = 11373^2 + 619^2 .

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, 174939 + ... + 175678.

Almost surely, 2^129728290 is an apocalyptic number.

129728290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129728290 is a deficient number, since it is larger than the sum of its proper divisors (110094422).

129728290 is a wasteful number, since it uses less digits than its factorization.

129728290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350661.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 129728290 is about 11389.8327467966. The cubic root of 129728290 is about 506.2265255589.

The spelling of 129728290 in words is "one hundred twenty-nine million, seven hundred twenty-eight thousand, two hundred ninety".