28028309709486 has 128 divisors (see below), whose sum is σ = 62495286497280. Its totient is φ = 8334780489728.

The previous prime is 28028309709451. The next prime is 28028309709487. The reversal of 28028309709486 is 68490790382082.

It is a super-2 number, since 2×28028309709486² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28028309709487) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2139069211 + ... + 2139082313.

It is an arithmetic number, because the mean of its divisors is an integer number (488244425760).

Almost surely, 2^{28028309709486} is an apocalyptic number.

28028309709486 is an abundant number, since it is smaller than the sum of its proper divisors (34466976787794).

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

28028309709486 is a wasteful number, since it uses less digits than its factorization.

28028309709486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21330.

The product of its (nonzero) digits is 83607552, while the sum is 66.

The spelling of 28028309709486 in words is "twenty-eight trillion, twenty-eight billion, three hundred nine million, seven hundred nine thousand, four hundred eighty-six".