12642780 has 24 divisors (see below), whose sum is σ = 35399952. Its totient is φ = 3371392.

The previous prime is 12642767. The next prime is 12642787. The reversal of 12642780 is 8724621.

12642780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×12642780² = 319679772256800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12642787) 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, 105297 + ... + 105416.

It is an arithmetic number, because the mean of its divisors is an integer number (1474998).

Almost surely, 2^12642780 is an apocalyptic number.

12642780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12642780 is an abundant number, since it is smaller than the sum of its proper divisors (22757172).

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

12642780 is a wasteful number, since it uses less digits than its factorization.

12642780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210725 (or 210723 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 12642780 is about 3555.6687134771. The cubic root of 12642780 is about 232.9597331976.

The spelling of 12642780 in words is "twelve million, six hundred forty-two thousand, seven hundred eighty".