1271545640 has 32 divisors (see below), whose sum is σ = 2862000000. Its totient is φ = 508436544.

The previous prime is 1271545633. The next prime is 1271545711. The reversal of 1271545640 is 465451721.

It is a self number, because there is not a number n which added to its sum of digits gives 1271545640.

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, 196781 + ... + 203139.

It is an arithmetic number, because the mean of its divisors is an integer number (89437500).

Almost surely, 2^1271545640 is an apocalyptic number.

1271545640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1271545640 is an abundant number, since it is smaller than the sum of its proper divisors (1590454360).

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

1271545640 is a wasteful number, since it uses less digits than its factorization.

1271545640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11369 (or 11365 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 1271545640 is about 35658.7386204280. The cubic root of 1271545640 is about 1083.3712784079.

The spelling of 1271545640 in words is "one billion, two hundred seventy-one million, five hundred forty-five thousand, six hundred forty".