128742899 has 8 divisors (see below), whose sum is σ = 129539520. Its totient is φ = 127949416.

The previous prime is 128742857. The next prime is 128742931. The reversal of 128742899 is 998247821.

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

It is a cyclic number.

It is not a de Polignac number, because 128742899 - 2¹⁶ = 128677363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128742839) 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, 195032 + ... + 195690.

It is an arithmetic number, because the mean of its divisors is an integer number (16192440).

Almost surely, 2^128742899 is an apocalyptic number.

128742899 is a deficient number, since it is larger than the sum of its proper divisors (796621).

128742899 is an equidigital number, since it uses as much as digits as its factorization.

128742899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1569.

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

The square root of 128742899 is about 11346.4928061494. The cubic root of 128742899 is about 504.9415336032.

The spelling of 128742899 in words is "one hundred twenty-eight million, seven hundred forty-two thousand, eight hundred ninety-nine".