12720988 has 36 divisors (see below), whose sum is σ = 26544672. Its totient is φ = 5315520.

The previous prime is 12720977. The next prime is 12720997. The reversal of 12720988 is 88902721.

It is a super-2 number, since 2×12720988² = 323647071392288, which contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 7245 + ... + 8827.

It is an arithmetic number, because the mean of its divisors is an integer number (737352).

Almost surely, 2^12720988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12720988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13272336).

12720988 is an abundant number, since it is smaller than the sum of its proper divisors (13823684).

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

12720988 is a wasteful number, since it uses less digits than its factorization.

12720988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1642 (or 1633 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 12720988 is about 3566.6494080579. The cubic root of 12720988 is about 233.4391075989.

It can be divided in two parts, 127 and 20988, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 12720988 in words is "twelve million, seven hundred twenty thousand, nine hundred eighty-eight".