129067890 has 32 divisors (see below), whose sum is σ = 354015360. Its totient is φ = 29501184.

The previous prime is 129067843. The next prime is 129067891. The reversal of 129067890 is 98760921.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129067891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307095 + ... + 307514.

It is an arithmetic number, because the mean of its divisors is an integer number (11062980).

Almost surely, 2^129067890 is an apocalyptic number.

129067890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129067890 is an abundant number, since it is smaller than the sum of its proper divisors (224947470).

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

129067890 is a wasteful number, since it uses less digits than its factorization.

129067890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614626.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 129067890 is about 11360.8049890842. The cubic root of 129067890 is about 505.3660581552.

The spelling of 129067890 in words is "one hundred twenty-nine million, sixty-seven thousand, eight hundred ninety".