28072771640 has 16 divisors (see below), whose sum is σ = 63163736280. Its totient is φ = 11229108640.

The previous prime is 28072771613. The next prime is 28072771667. The reversal of 28072771640 is 4617727082.

It is an interprime number because it is at equal distance from previous prime (28072771613) and next prime (28072771667).

It is a junction number, because it is equal to n+sod(n) for n = 28072771591 and 28072771600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350909606 + ... + 350909685.

Almost surely, 2^28072771640 is an apocalyptic number.

28072771640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28072771640 is an abundant number, since it is smaller than the sum of its proper divisors (35090964640).

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

28072771640 is a wasteful number, since it uses less digits than its factorization.

28072771640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701819302 (or 701819298 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 44.

The spelling of 28072771640 in words is "twenty-eight billion, seventy-two million, seven hundred seventy-one thousand, six hundred forty".