128149078 has 4 divisors (see below), whose sum is σ = 192223620. Its totient is φ = 64074538.

The previous prime is 128149061. The next prime is 128149081. The reversal of 128149078 is 870941821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 870941821 = 811 ⋅1073911.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 128149078.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32037268 + ... + 32037271.

It is an arithmetic number, because the mean of its divisors is an integer number (48055905).

Almost surely, 2^128149078 is an apocalyptic number.

128149078 is a deficient number, since it is larger than the sum of its proper divisors (64074542).

128149078 is an equidigital number, since it uses as much as digits as its factorization.

128149078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64074541.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 128149078 is about 11320.2949608215. The cubic root of 128149078 is about 504.1639966649.

The spelling of 128149078 in words is "one hundred twenty-eight million, one hundred forty-nine thousand, seventy-eight".