1272616678 has 4 divisors (see below), whose sum is σ = 1908925020. Its totient is φ = 636308338.

The previous prime is 1272616669. The next prime is 1272616679. The reversal of 1272616678 is 8766162721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8766162721 = 3331 ⋅2631691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1272616679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318154168 + ... + 318154171.

It is an arithmetic number, because the mean of its divisors is an integer number (477231255).

Almost surely, 2^1272616678 is an apocalyptic number.

1272616678 is a deficient number, since it is larger than the sum of its proper divisors (636308342).

1272616678 is an equidigital number, since it uses as much as digits as its factorization.

1272616678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636308341.

The product of its digits is 338688, while the sum is 46.

The square root of 1272616678 is about 35673.7533489259. The cubic root of 1272616678 is about 1083.6753718766.

The spelling of 1272616678 in words is "one billion, two hundred seventy-two million, six hundred sixteen thousand, six hundred seventy-eight".