28191741870 has 64 divisors (see below), whose sum is σ = 70194600000. Its totient is φ = 7237687296.

The previous prime is 28191741839. The next prime is 28191741871. The reversal of 28191741870 is 7814719182.

It is a super-2 number, since 2×28191741870² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28191741871) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 257206 + ... + 350054.

It is an arithmetic number, because the mean of its divisors is an integer number (1096790625).

Almost surely, 2^28191741870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28191741870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35097300000).

28191741870 is an abundant number, since it is smaller than the sum of its proper divisors (42002858130).

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

28191741870 is a wasteful number, since it uses less digits than its factorization.

28191741870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93237.

The product of its (nonzero) digits is 225792, while the sum is 48.

The spelling of 28191741870 in words is "twenty-eight billion, one hundred ninety-one million, seven hundred forty-one thousand, eight hundred seventy".