28078576647 has 32 divisors (see below), whose sum is σ = 42235582464. Its totient is φ = 16438473600.

The previous prime is 28078576607. The next prime is 28078576657. The reversal of 28078576647 is 74667587082.

It is a happy number.

It is not a de Polignac number, because 28078576647 - 2¹¹ = 28078574599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28078576607) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 545173 + ... + 594449.

It is an arithmetic number, because the mean of its divisors is an integer number (1319861952).

Almost surely, 2^28078576647 is an apocalyptic number.

28078576647 is a deficient number, since it is larger than the sum of its proper divisors (14157005817).

28078576647 is a wasteful number, since it uses less digits than its factorization.

28078576647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49879.

The product of its (nonzero) digits is 31610880, while the sum is 60.

The spelling of 28078576647 in words is "twenty-eight billion, seventy-eight million, five hundred seventy-six thousand, six hundred forty-seven".