28172177670 has 256 divisors, whose sum is σ = 87126036480. Its totient is φ = 5666512896.

The previous prime is 28172177669. The next prime is 28172177699. The reversal of 28172177670 is 7677127182.

It is a Curzon number.

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, 25680562 + ... + 25681658.

It is an arithmetic number, because the mean of its divisors is an integer number (340336080).

Almost surely, 2^28172177670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28172177670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43563018240).

28172177670 is an abundant number, since it is smaller than the sum of its proper divisors (58953858810).

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

28172177670 is a wasteful number, since it uses less digits than its factorization.

28172177670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1559.

The product of its (nonzero) digits is 460992, while the sum is 48.

The spelling of 28172177670 in words is "twenty-eight billion, one hundred seventy-two million, one hundred seventy-seven thousand, six hundred seventy".