128840551 has 12 divisors (see below), whose sum is σ = 150099240. Its totient is φ = 110270160.

The previous prime is 128840521. The next prime is 128840563. The reversal of 128840551 is 155048821.

It is not a de Polignac number, because 128840551 - 2⁷ = 128840423 is a prime.

It is a super-4 number, since 4×128840551⁴ (a number of 34 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128840521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40561 + ... + 43621.

It is an arithmetic number, because the mean of its divisors is an integer number (12508270).

Almost surely, 2^128840551 is an apocalyptic number.

128840551 is a deficient number, since it is larger than the sum of its proper divisors (21258689).

128840551 is an equidigital number, since it uses as much as digits as its factorization.

128840551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3934 (or 3927 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 34.

The square root of 128840551 is about 11350.7951703834. The cubic root of 128840551 is about 505.0691680575.

The spelling of 128840551 in words is "one hundred twenty-eight million, eight hundred forty thousand, five hundred fifty-one".