1266274640 has 40 divisors (see below), whose sum is σ = 2960569440. Its totient is φ = 503674496.

The previous prime is 1266274613. The next prime is 1266274649. The reversal of 1266274640 is 464726621.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 1266274594 and 1266274603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266274649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29894 + ... + 58533.

It is an arithmetic number, because the mean of its divisors is an integer number (74014236).

Almost surely, 2^1266274640 is an apocalyptic number.

1266274640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1266274640 is an abundant number, since it is smaller than the sum of its proper divisors (1694294800).

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

1266274640 is a wasteful number, since it uses less digits than its factorization.

1266274640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88619 (or 88613 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 1266274640 is about 35584.7529146965. The cubic root of 1266274640 is about 1081.8722212361.

The spelling of 1266274640 in words is "one billion, two hundred sixty-six million, two hundred seventy-four thousand, six hundred forty".