28727381670 has 32 divisors (see below), whose sum is σ = 74249233632. Its totient is φ = 7071355392.

The previous prime is 28727381659. The next prime is 28727381687. The reversal of 28727381670 is 7618372782.

It is a happy number.

It is a super-2 number, since 2×28727381670² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36829587 + ... + 36830366.

It is an arithmetic number, because the mean of its divisors is an integer number (2320288551).

Almost surely, 2^28727381670 is an apocalyptic number.

28727381670 is an abundant number, since it is smaller than the sum of its proper divisors (45521851962).

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

28727381670 is a wasteful number, since it uses less digits than its factorization.

28727381670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73659976.

The product of its (nonzero) digits is 1580544, while the sum is 51.

The spelling of 28727381670 in words is "twenty-eight billion, seven hundred twenty-seven million, three hundred eighty-one thousand, six hundred seventy".