128678901 has 8 divisors (see below), whose sum is σ = 184769760. Its totient is φ = 79186992.

The previous prime is 128678897. The next prime is 128678917. The reversal of 128678901 is 109876821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128678901 - 2² = 128678897 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128678971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1649691 + ... + 1649768.

It is an arithmetic number, because the mean of its divisors is an integer number (23096220).

Almost surely, 2^128678901 is an apocalyptic number.

It is an amenable number.

128678901 is a deficient number, since it is larger than the sum of its proper divisors (56090859).

128678901 is a wasteful number, since it uses less digits than its factorization.

128678901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3299475.

The product of its (nonzero) digits is 48384, while the sum is 42.

The square root of 128678901 is about 11343.6722889900. The cubic root of 128678901 is about 504.8578510477.

The spelling of 128678901 in words is "one hundred twenty-eight million, six hundred seventy-eight thousand, nine hundred one".