27800764840 has 32 divisors (see below), whose sum is σ = 62557715880. Its totient is φ = 11119240192.

The previous prime is 27800764829. The next prime is 27800764841. The reversal of 27800764840 is 4846700872.

It can be written as a sum of positive squares in 4 ways, for example, as 19825203204 + 7975561636 = 140802^2 + 89306^2 .

It is not an unprimeable number, because it can be changed into a prime (27800764841) 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, 491292 + ... + 544948.

Almost surely, 2^27800764840 is an apocalyptic number.

27800764840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27800764840 is an abundant number, since it is smaller than the sum of its proper divisors (34756951040).

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

27800764840 is a wasteful number, since it uses less digits than its factorization.

27800764840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66621 (or 66617 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 46.

The spelling of 27800764840 in words is "twenty-seven billion, eight hundred million, seven hundred sixty-four thousand, eight hundred forty".