128715998 has 8 divisors (see below), whose sum is σ = 193289592. Its totient is φ = 64286136.

The previous prime is 128715997. The next prime is 128716001. The reversal of 128715998 is 899517821.

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

It is a super-2 number, since 2×128715998² = 33135616282272008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128715991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33665 + ... + 37292.

It is an arithmetic number, because the mean of its divisors is an integer number (24161199).

Almost surely, 2^128715998 is an apocalyptic number.

128715998 is a deficient number, since it is larger than the sum of its proper divisors (64573594).

128715998 is an equidigital number, since it uses as much as digits as its factorization.

128715998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71866.

The product of its digits is 362880, while the sum is 50.

The square root of 128715998 is about 11345.3073118360. The cubic root of 128715998 is about 504.9063617516.

The spelling of 128715998 in words is "one hundred twenty-eight million, seven hundred fifteen thousand, nine hundred ninety-eight".