128506899 has 8 divisors (see below), whose sum is σ = 180360640. Its totient is φ = 81162216.

The previous prime is 128506891. The next prime is 128506907. The reversal of 128506899 is 998605821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (128506891) and next prime (128506907).

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

It is not a de Polignac number, because 128506899 - 2³ = 128506891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128506891) 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, 1127197 + ... + 1127310.

It is an arithmetic number, because the mean of its divisors is an integer number (22545080).

Almost surely, 2^128506899 is an apocalyptic number.

128506899 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

128506899 is a deficient number, since it is larger than the sum of its proper divisors (51853741).

128506899 is a wasteful number, since it uses less digits than its factorization.

128506899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2254529.

The product of its (nonzero) digits is 311040, while the sum is 48.

The square root of 128506899 is about 11336.0883465153. The cubic root of 128506899 is about 504.6328069548.

The spelling of 128506899 in words is "one hundred twenty-eight million, five hundred six thousand, eight hundred ninety-nine".