28861721729322 has 16 divisors (see below), whose sum is σ = 57750154934592. Its totient is φ = 9616121997120.

The previous prime is 28861721729257. The next prime is 28861721729327. The reversal of 28861721729322 is 22392712716882.

It is not an unprimeable number, because it can be changed into a prime (28861721729327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1112964118 + ... + 1112990049.

It is an arithmetic number, because the mean of its divisors is an integer number (3609384683412).

Almost surely, 2^{28861721729322} is an apocalyptic number.

28861721729322 is an abundant number, since it is smaller than the sum of its proper divisors (28888433205270).

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

28861721729322 is a wasteful number, since it uses less digits than its factorization.

28861721729322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2225956333.

The product of its digits is 16257024, while the sum is 60.

The spelling of 28861721729322 in words is "twenty-eight trillion, eight hundred sixty-one billion, seven hundred twenty-one million, seven hundred twenty-nine thousand, three hundred twenty-two".