128278073 has 48 divisors (see below), whose sum is σ = 176639616. Its totient is φ = 90155520.

The previous prime is 128278069. The next prime is 128278079. The reversal of 128278073 is 370872821.

It is not a de Polignac number, because 128278073 - 2² = 128278069 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128278079) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2420315 + ... + 2420367.

It is an arithmetic number, because the mean of its divisors is an integer number (3679992).

Almost surely, 2^128278073 is an apocalyptic number.

It is an amenable number.

128278073 is a deficient number, since it is larger than the sum of its proper divisors (48361543).

128278073 is a wasteful number, since it uses less digits than its factorization.

128278073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 128278073 is about 11325.9910383154. The cubic root of 128278073 is about 504.3331039438. Note that the first 3 decimals are identical.

The spelling of 128278073 in words is "one hundred twenty-eight million, two hundred seventy-eight thousand, seventy-three".