129819428 has 24 divisors (see below), whose sum is σ = 236839680. Its totient is φ = 62185760.

The previous prime is 129819427. The next prime is 129819461. The reversal of 129819428 is 824918921.

129819428 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (129819427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10925 + ... + 19467.

It is an arithmetic number, because the mean of its divisors is an integer number (9868320).

Almost surely, 2^129819428 is an apocalyptic number.

It is an amenable number.

129819428 is a deficient number, since it is larger than the sum of its proper divisors (107020252).

129819428 is a wasteful number, since it uses less digits than its factorization.

129819428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8707 (or 8705 counting only the distinct ones).

The product of its digits is 82944, while the sum is 44.

The square root of 129819428 is about 11393.8328932805. The cubic root of 129819428 is about 506.3450442290.

The spelling of 129819428 in words is "one hundred twenty-nine million, eight hundred nineteen thousand, four hundred twenty-eight".