28149171642 has 144 divisors (see below), whose sum is σ = 66812788224. Its totient is φ = 8558208000.

The previous prime is 28149171641. The next prime is 28149171719. The reversal of 28149171642 is 24617194182.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28149171641) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 40736517 + ... + 40737207.

It is an arithmetic number, because the mean of its divisors is an integer number (463977696).

Almost surely, 2^28149171642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28149171642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33406394112).

28149171642 is an abundant number, since it is smaller than the sum of its proper divisors (38663616582).

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

28149171642 is a wasteful number, since it uses less digits than its factorization.

28149171642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965 (or 945 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The spelling of 28149171642 in words is "twenty-eight billion, one hundred forty-nine million, one hundred seventy-one thousand, six hundred forty-two".