28078732605 has 128 divisors (see below), whose sum is σ = 58260602880. Its totient is φ = 11208637440.

The previous prime is 28078732579. The next prime is 28078732613. The reversal of 28078732605 is 50623787082.

It is not a de Polignac number, because 28078732605 - 2⁹ = 28078732093 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3371907 + ... + 3380223.

It is an arithmetic number, because the mean of its divisors is an integer number (455160960).

Almost surely, 2^28078732605 is an apocalyptic number.

It is an amenable number.

28078732605 is an abundant number, since it is smaller than the sum of its proper divisors (30181870275).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28078732605 is a wasteful number, since it uses less digits than its factorization.

28078732605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8459.

The product of its (nonzero) digits is 1128960, while the sum is 48.

The spelling of 28078732605 in words is "twenty-eight billion, seventy-eight million, seven hundred thirty-two thousand, six hundred five".