129668890 has 16 divisors (see below), whose sum is σ = 251358408. Its totient is φ = 47877696.

The previous prime is 129668881. The next prime is 129668923. The reversal of 129668890 is 98866921.

It is a happy number.

129668890 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 52983841 + 76685049 = 7279^2 + 8757^2 .

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, 498597 + ... + 498856.

Almost surely, 2^129668890 is an apocalyptic number.

129668890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129668890 is a deficient number, since it is larger than the sum of its proper divisors (121689518).

129668890 is a wasteful number, since it uses less digits than its factorization.

129668890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997473.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 129668890 is about 11387.2248594642. The cubic root of 129668890 is about 506.1492500825.

The spelling of 129668890 in words is "one hundred twenty-nine million, six hundred sixty-eight thousand, eight hundred ninety".