28971726555590 has 32 divisors (see below), whose sum is σ = 64183517294400. Its totient is φ = 9169073898624.

The previous prime is 28971726555523. The next prime is 28971726555661. The reversal of 28971726555590 is 9555562717982.

It is a happy number.

It is a super-2 number, since 2×28971726555590² (a number of 28 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, 15918530165 + ... + 15918531984.

It is an arithmetic number, because the mean of its divisors is an integer number (2005734915450).

Almost surely, 2^{28971726555590} is an apocalyptic number.

28971726555590 is an abundant number, since it is smaller than the sum of its proper divisors (35211790738810).

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

28971726555590 is a wasteful number, since it uses less digits than its factorization.

28971726555590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31837062176.

The product of its (nonzero) digits is 476280000, while the sum is 71.

The spelling of 28971726555590 in words is "twenty-eight trillion, nine hundred seventy-one billion, seven hundred twenty-six million, five hundred fifty-five thousand, five hundred ninety".