28196393620 has 24 divisors (see below), whose sum is σ = 59215689288. Its totient is φ = 11277936000.

The previous prime is 28196393551. The next prime is 28196393627. The reversal of 28196393620 is 2639369182.

It can be written as a sum of positive squares in 4 ways, for example, as 4456363536 + 23740030084 = 66756^2 + 154078^2 .

It is a super-2 number, since 2×28196393620² (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 (28196393627) 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, 553630 + ... + 602410.

It is an arithmetic number, because the mean of its divisors is an integer number (2467320387).

Almost surely, 2^28196393620 is an apocalyptic number.

28196393620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28196393620 is an abundant number, since it is smaller than the sum of its proper divisors (31019295668).

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

28196393620 is a wasteful number, since it uses less digits than its factorization.

28196393620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77691 (or 77689 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 49.

The spelling of 28196393620 in words is "twenty-eight billion, one hundred ninety-six million, three hundred ninety-three thousand, six hundred twenty".