27775563420 has 48 divisors (see below), whose sum is σ = 84841723008. Its totient is φ = 6733469760.

The previous prime is 27775563397. The next prime is 27775563433. The reversal of 27775563420 is 2436557772.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 27775563420.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21041434 + ... + 21042753.

It is an arithmetic number, because the mean of its divisors is an integer number (1767535896).

Almost surely, 2^27775563420 is an apocalyptic number.

27775563420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27775563420 is an abundant number, since it is smaller than the sum of its proper divisors (57066159588).

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

27775563420 is a wasteful number, since it uses less digits than its factorization.

27775563420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42084210 (or 42084208 counting only the distinct ones).

The product of its (nonzero) digits is 2469600, while the sum is 48.

It can be divided in two parts, 27775 and 563420, that added together give a palindrome (591195).

The spelling of 27775563420 in words is "twenty-seven billion, seven hundred seventy-five million, five hundred sixty-three thousand, four hundred twenty".