12507780 has 24 divisors (see below), whose sum is σ = 35021952. Its totient is φ = 3335392.

The previous prime is 12507773. The next prime is 12507821. The reversal of 12507780 is 8770521.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104172 + ... + 104291.

It is an arithmetic number, because the mean of its divisors is an integer number (1459248).

Almost surely, 2^12507780 is an apocalyptic number.

12507780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12507780 is an abundant number, since it is smaller than the sum of its proper divisors (22514172).

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

12507780 is a wasteful number, since it uses less digits than its factorization.

12507780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208475 (or 208473 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 12507780 is about 3536.6339929374. The cubic root of 12507780 is about 232.1275804430.

The spelling of 12507780 in words is "twelve million, five hundred seven thousand, seven hundred eighty".