128498729 has 8 divisors (see below), whose sum is σ = 135483840. Its totient is φ = 121535856.

The previous prime is 128498719. The next prime is 128498731. The reversal of 128498729 is 927894821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128498729 - 2¹² = 128494633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128498719) 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, 7067 + ... + 17519.

It is an arithmetic number, because the mean of its divisors is an integer number (16935480).

Almost surely, 2^128498729 is an apocalyptic number.

128498729 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

128498729 is a deficient number, since it is larger than the sum of its proper divisors (6985111).

128498729 is a wasteful number, since it uses less digits than its factorization.

128498729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11119.

The product of its digits is 580608, while the sum is 50.

The square root of 128498729 is about 11335.7279872093. The cubic root of 128498729 is about 504.6221124903.

The spelling of 128498729 in words is "one hundred twenty-eight million, four hundred ninety-eight thousand, seven hundred twenty-nine".