128977067 has 4 divisors (see below), whose sum is σ = 129516960. Its totient is φ = 128437176.

The previous prime is 128977061. The next prime is 128977097. The reversal of 128977067 is 760779821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128977067 - 2⁶ = 128977003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128977061) 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, 269588 + ... + 270065.

It is an arithmetic number, because the mean of its divisors is an integer number (32379240).

Almost surely, 2^128977067 is an apocalyptic number.

128977067 is a deficient number, since it is larger than the sum of its proper divisors (539893).

128977067 is an equidigital number, since it uses as much as digits as its factorization.

128977067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539892.

The product of its (nonzero) digits is 296352, while the sum is 47.

The square root of 128977067 is about 11356.8070776957. The cubic root of 128977067 is about 505.2474910151.

The spelling of 128977067 in words is "one hundred twenty-eight million, nine hundred seventy-seven thousand, sixty-seven".