1263457278 has 80 divisors (see below), whose sum is σ = 2937790944. Its totient is φ = 405518400.

The previous prime is 1263457277. The next prime is 1263457303. The reversal of 1263457278 is 8727543621.

1263457278 is a `hidden beast` number, since 1 + 2 + 6 + 3 + 4 + 572 + 78 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263457277) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 604351 + ... + 606437.

Almost surely, 2^1263457278 is an apocalyptic number.

1263457278 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1263457278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1468895472).

1263457278 is an abundant number, since it is smaller than the sum of its proper divisors (1674333666).

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

1263457278 is a wasteful number, since it uses less digits than its factorization.

1263457278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2239 (or 2230 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 1263457278 is about 35545.1442253369. The cubic root of 1263457278 is about 1081.0692650878.

The spelling of 1263457278 in words is "one billion, two hundred sixty-three million, four hundred fifty-seven thousand, two hundred seventy-eight".