128765477 has 12 divisors (see below), whose sum is σ = 137497920. Its totient is φ = 120523128.

The previous prime is 128765473. The next prime is 128765479. The reversal of 128765477 is 774567821.

It is a happy number.

It is not a de Polignac number, because 128765477 - 2² = 128765473 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128765471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22274 + ... + 27452.

It is an arithmetic number, because the mean of its divisors is an integer number (11458160).

Almost surely, 2^128765477 is an apocalyptic number.

It is an amenable number.

128765477 is a deficient number, since it is larger than the sum of its proper divisors (8732443).

128765477 is an equidigital number, since it uses as much as digits as its factorization.

128765477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5272 (or 5249 counting only the distinct ones).

The product of its digits is 658560, while the sum is 47.

The square root of 128765477 is about 11347.4876955210. The cubic root of 128765477 is about 504.9710495445.

The spelling of 128765477 in words is "one hundred twenty-eight million, seven hundred sixty-five thousand, four hundred seventy-seven".