128278292 has 6 divisors (see below), whose sum is σ = 224487018. Its totient is φ = 64139144.

The previous prime is 128278273. The next prime is 128278307. The reversal of 128278292 is 292872821.

It can be written as a sum of positive squares in only one way, i.e., 128278276 + 16 = 11326^2 + 4^2 .

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, 16034783 + ... + 16034790.

It is an arithmetic number, because the mean of its divisors is an integer number (37414503).

Almost surely, 2^128278292 is an apocalyptic number.

It is an amenable number.

128278292 is a deficient number, since it is larger than the sum of its proper divisors (96208726).

128278292 is a wasteful number, since it uses less digits than its factorization.

128278292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32069577 (or 32069575 counting only the distinct ones).

The product of its digits is 64512, while the sum is 41.

The square root of 128278292 is about 11326.0007063394. Note that the first 3 decimals coincide. The cubic root of 128278292 is about 504.3333909476. Note that the first 4 decimals are identical.

The spelling of 128278292 in words is "one hundred twenty-eight million, two hundred seventy-eight thousand, two hundred ninety-two".