12277720 has 64 divisors (see below), whose sum is σ = 34009920. Its totient is φ = 3884544.

The previous prime is 12277709. The next prime is 12277721. The reversal of 12277720 is 2777221.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12277721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1954 + ... + 5326.

It is an arithmetic number, because the mean of its divisors is an integer number (531405).

Almost surely, 2^12277720 is an apocalyptic number.

12277720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12277720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17004960).

12277720 is an abundant number, since it is smaller than the sum of its proper divisors (21732200).

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

12277720 is a wasteful number, since it uses less digits than its factorization.

12277720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3404 (or 3400 counting only the distinct ones).

The product of its (nonzero) digits is 2744, while the sum is 28.

The square root of 12277720 is about 3503.9577623025. The cubic root of 12277720 is about 230.6955629245.

The spelling of 12277720 in words is "twelve million, two hundred seventy-seven thousand, seven hundred twenty".