128616977 has 4 divisors (see below), whose sum is σ = 130245120. Its totient is φ = 126988836.

The previous prime is 128616973. The next prime is 128617031. The reversal of 128616977 is 779616821.

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: 779616821 = 17 ⋅45859813.

It is a cyclic number.

It is not a de Polignac number, because 128616977 - 2² = 128616973 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128616973) 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, 813953 + ... + 814110.

It is an arithmetic number, because the mean of its divisors is an integer number (32561280).

Almost surely, 2^128616977 is an apocalyptic number.

It is an amenable number.

128616977 is a deficient number, since it is larger than the sum of its proper divisors (1628143).

128616977 is an equidigital number, since it uses as much as digits as its factorization.

128616977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1628142.

The product of its digits is 254016, while the sum is 47.

The square root of 128616977 is about 11340.9425093332. The cubic root of 128616977 is about 504.7768539986.

The spelling of 128616977 in words is "one hundred twenty-eight million, six hundred sixteen thousand, nine hundred seventy-seven".