128627997 has 8 divisors (see below), whose sum is σ = 172124256. Its totient is φ = 85441872.

The previous prime is 128627953. The next prime is 128628023. The reversal of 128627997 is 799726821.

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

It is not a de Polignac number, because 128627997 - 2¹⁶ = 128562461 is a prime.

It is a super-2 number, since 2×128627997² = 33090323224464018, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128627927) 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, 76563 + ... + 78224.

It is an arithmetic number, because the mean of its divisors is an integer number (21515532).

Almost surely, 2^128627997 is an apocalyptic number.

It is an amenable number.

128627997 is a deficient number, since it is larger than the sum of its proper divisors (43496259).

128627997 is a wasteful number, since it uses less digits than its factorization.

128627997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155067.

The product of its digits is 762048, while the sum is 51.

The square root of 128627997 is about 11341.4283491983. The cubic root of 128627997 is about 504.7912701413.

The spelling of 128627997 in words is "one hundred twenty-eight million, six hundred twenty-seven thousand, nine hundred ninety-seven".