128797469 has 4 divisors (see below), whose sum is σ = 129276540. Its totient is φ = 128318400.

The previous prime is 128797463. The next prime is 128797499. The reversal of 128797469 is 964797821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36445369 + 92352100 = 6037^2 + 9610^2 .

It is a cyclic number.

It is not a de Polignac number, because 128797469 - 2⁴ = 128797453 is a prime.

It is a super-2 number, since 2×128797469² = 33177576041611922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128797469.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128797463) 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, 239132 + ... + 239669.

It is an arithmetic number, because the mean of its divisors is an integer number (32319135).

Almost surely, 2^128797469 is an apocalyptic number.

It is an amenable number.

128797469 is a deficient number, since it is larger than the sum of its proper divisors (479071).

128797469 is an equidigital number, since it uses as much as digits as its factorization.

128797469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479070.

The product of its digits is 1524096, while the sum is 53.

The square root of 128797469 is about 11348.8972592054. The cubic root of 128797469 is about 505.0128663846.

The spelling of 128797469 in words is "one hundred twenty-eight million, seven hundred ninety-seven thousand, four hundred sixty-nine".