28057636540 has 12 divisors (see below), whose sum is σ = 58921036776. Its totient is φ = 11223054608.

The previous prime is 28057636517. The next prime is 28057636549. The reversal of 28057636540 is 4563675082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28057636549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 701440894 + ... + 701440933.

It is an arithmetic number, because the mean of its divisors is an integer number (4910086398).

Almost surely, 2^28057636540 is an apocalyptic number.

28057636540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28057636540 is an abundant number, since it is smaller than the sum of its proper divisors (30863400236).

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

28057636540 is a wasteful number, since it uses less digits than its factorization.

28057636540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402881836 (or 1402881834 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 46.

The spelling of 28057636540 in words is "twenty-eight billion, fifty-seven million, six hundred thirty-six thousand, five hundred forty".