1263026778 has 16 divisors (see below), whose sum is σ = 2720365536. Its totient is φ = 388623600.

The previous prime is 1263026753. The next prime is 1263026803. The reversal of 1263026778 is 8776203621.

It is an interprime number because it is at equal distance from previous prime (1263026753) and next prime (1263026803).

It is a super-2 number, since 2×1263026778² = 3190473283890122568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8096248 + ... + 8096403.

It is an arithmetic number, because the mean of its divisors is an integer number (170022846).

Almost surely, 2^1263026778 is an apocalyptic number.

1263026778 is an abundant number, since it is smaller than the sum of its proper divisors (1457338758).

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

1263026778 is a wasteful number, since it uses less digits than its factorization.

1263026778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16192669.

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 1263026778 is about 35539.0880299425. The cubic root of 1263026778 is about 1080.9464662681.

The spelling of 1263026778 in words is "one billion, two hundred sixty-three million, twenty-six thousand, seven hundred seventy-eight".