128681965 has 8 divisors (see below), whose sum is σ = 162545760. Its totient is φ = 97527312.

The previous prime is 128681947. The next prime is 128681977. The reversal of 128681965 is 569186821.

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

It is a cyclic number.

It is not a de Polignac number, because 128681965 - 2⁹ = 128681453 is a prime.

It is a super-2 number, since 2×128681965² = 33118096232522450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 677179 + ... + 677368.

It is an arithmetic number, because the mean of its divisors is an integer number (20318220).

Almost surely, 2^128681965 is an apocalyptic number.

It is an amenable number.

128681965 is a deficient number, since it is larger than the sum of its proper divisors (33863795).

128681965 is a wasteful number, since it uses less digits than its factorization.

128681965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354571.

The product of its digits is 207360, while the sum is 46.

The square root of 128681965 is about 11343.8073414529. The cubic root of 128681965 is about 504.8618581075.

The spelling of 128681965 in words is "one hundred twenty-eight million, six hundred eighty-one thousand, nine hundred sixty-five".