128930577 has 4 divisors (see below), whose sum is σ = 171907440. Its totient is φ = 85953716.

The previous prime is 128930573. The next prime is 128930587. The reversal of 128930577 is 775039821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 775039821 = 3 ⋅258346607.

It is a cyclic number.

It is not a de Polignac number, because 128930577 - 2² = 128930573 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128930573) 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, 21488427 + ... + 21488432.

It is an arithmetic number, because the mean of its divisors is an integer number (42976860).

Almost surely, 2^128930577 is an apocalyptic number.

It is an amenable number.

128930577 is a deficient number, since it is larger than the sum of its proper divisors (42976863).

128930577 is an equidigital number, since it uses as much as digits as its factorization.

128930577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42976862.

The product of its (nonzero) digits is 105840, while the sum is 42.

The square root of 128930577 is about 11354.7601031462. The cubic root of 128930577 is about 505.1867779514.

The spelling of 128930577 in words is "one hundred twenty-eight million, nine hundred thirty thousand, five hundred seventy-seven".