1276658478 has 12 divisors (see below), whose sum is σ = 2766093408. Its totient is φ = 425552820.

The previous prime is 1276658473. The next prime is 1276658491. The reversal of 1276658478 is 8748566721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1276658473) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35462718 + ... + 35462753.

It is an arithmetic number, because the mean of its divisors is an integer number (230507784).

Almost surely, 2^1276658478 is an apocalyptic number.

1276658478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1276658478 is an abundant number, since it is smaller than the sum of its proper divisors (1489434930).

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

1276658478 is a wasteful number, since it uses less digits than its factorization.

1276658478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70925479 (or 70925476 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 54.

The square root of 1276658478 is about 35730.3579327160. The cubic root of 1276658478 is about 1084.8214017937.

The spelling of 1276658478 in words is "one billion, two hundred seventy-six million, six hundred fifty-eight thousand, four hundred seventy-eight".