129026628 has 48 divisors (see below), whose sum is σ = 340200000. Its totient is φ = 42277824.

The previous prime is 129026627. The next prime is 129026641. The reversal of 129026628 is 826620921.

It is a happy number.

129026628 is a `hidden beast` number, since 1 + 2 + 9 + 0 + 26 + 628 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 129026592 and 129026601.

It is not an unprimeable number, because it can be changed into a prime (129026621) 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, 3753 + ... + 16496.

It is an arithmetic number, because the mean of its divisors is an integer number (7087500).

Almost surely, 2^129026628 is an apocalyptic number.

129026628 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

129026628 is an abundant number, since it is smaller than the sum of its proper divisors (211173372).

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

129026628 is a wasteful number, since it uses less digits than its factorization.

129026628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20321 (or 20313 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 129026628 is about 11358.9888634508. The cubic root of 129026628 is about 505.3121985500.

The spelling of 129026628 in words is "one hundred twenty-nine million, twenty-six thousand, six hundred twenty-eight".