12508778 has 4 divisors (see below), whose sum is σ = 18763170. Its totient is φ = 6254388.

The previous prime is 12508763. The next prime is 12508789. The reversal of 12508778 is 87780521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7414729 + 5094049 = 2723^2 + 2257^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3127193 + ... + 3127196.

Almost surely, 2^12508778 is an apocalyptic number.

12508778 is a deficient number, since it is larger than the sum of its proper divisors (6254392).

12508778 is an equidigital number, since it uses as much as digits as its factorization.

12508778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6254391.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 12508778 is about 3536.7750847347. The cubic root of 12508778 is about 232.1337541249.

The spelling of 12508778 in words is "twelve million, five hundred eight thousand, seven hundred seventy-eight".