1272731660 has 24 divisors (see below), whose sum is σ = 2758955136. Its totient is φ = 492670080.

The previous prime is 1272731653. The next prime is 1272731687. The reversal of 1272731660 is 661372721.

It is a self number, because there is not a number n which added to its sum of digits gives 1272731660.

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, 1025777 + ... + 1027016.

It is an arithmetic number, because the mean of its divisors is an integer number (114956464).

Almost surely, 2^1272731660 is an apocalyptic number.

1272731660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1272731660 is an abundant number, since it is smaller than the sum of its proper divisors (1486223476).

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

1272731660 is a wasteful number, since it uses less digits than its factorization.

1272731660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052833 (or 2052831 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 1272731660 is about 35675.3648895144. The cubic root of 1272731660 is about 1083.7080078911.

The spelling of 1272731660 in words is "one billion, two hundred seventy-two million, seven hundred thirty-one thousand, six hundred sixty".