129216888 has 24 divisors (see below), whose sum is σ = 349962600. Its totient is φ = 43072272.

The previous prime is 129216887. The next prime is 129216889. The reversal of 129216888 is 888612921.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (129216887) and next prime (129216889).

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129216887) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 897268 + ... + 897411.

It is an arithmetic number, because the mean of its divisors is an integer number (14581775).

Almost surely, 2^129216888 is an apocalyptic number.

129216888 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

129216888 is an abundant number, since it is smaller than the sum of its proper divisors (220745712).

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

129216888 is a wasteful number, since it uses less digits than its factorization.

129216888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794691 (or 1794684 counting only the distinct ones).

The product of its digits is 110592, while the sum is 45.

The square root of 129216888 is about 11367.3606435267. The cubic root of 129216888 is about 505.5604508768.

The spelling of 129216888 in words is "one hundred twenty-nine million, two hundred sixteen thousand, eight hundred eighty-eight".