128722497 has 8 divisors (see below), whose sum is σ = 171716160. Its totient is φ = 85771920.

The previous prime is 128722471. The next prime is 128722523. The reversal of 128722497 is 794227821.

It is an interprime number because it is at equal distance from previous prime (128722471) and next prime (128722523).

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

It is not a de Polignac number, because 128722497 - 2⁷ = 128722369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128722427) 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, 2997 + ... + 16322.

It is an arithmetic number, because the mean of its divisors is an integer number (21464520).

Almost surely, 2^128722497 is an apocalyptic number.

It is an amenable number.

128722497 is a deficient number, since it is larger than the sum of its proper divisors (42993663).

128722497 is a wasteful number, since it uses less digits than its factorization.

128722497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21543.

The product of its digits is 112896, while the sum is 42.

The square root of 128722497 is about 11345.5937262005. The cubic root of 128722497 is about 504.9148593517.

The spelling of 128722497 in words is "one hundred twenty-eight million, seven hundred twenty-two thousand, four hundred ninety-seven".