1271067640 has 32 divisors (see below), whose sum is σ = 2874437280. Its totient is φ = 505843072.

The previous prime is 1271067617. The next prime is 1271067641. The reversal of 1271067640 is 467601721.

It is a happy number.

It is a super-2 number, since 2×1271067640² = 3231225890910339200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1271067596 and 1271067605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271067641) 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, 72772 + ... + 88531.

It is an arithmetic number, because the mean of its divisors is an integer number (89826165).

Almost surely, 2^1271067640 is an apocalyptic number.

1271067640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1271067640 is an abundant number, since it is smaller than the sum of its proper divisors (1603369640).

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

1271067640 is a wasteful number, since it uses less digits than its factorization.

1271067640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161511 (or 161507 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 1271067640 is about 35652.0355660094. The cubic root of 1271067640 is about 1083.2355075899.

The spelling of 1271067640 in words is "one billion, two hundred seventy-one million, sixty-seven thousand, six hundred forty".