1273012660 has 24 divisors (see below), whose sum is σ = 2717154216. Its totient is φ = 500856960.

The previous prime is 1273012651. The next prime is 1273012661. The reversal of 1273012660 is 662103721.

It can be written as a sum of positive squares in 4 ways, for example, as 36505764 + 1236506896 = 6042^2 + 35164^2 .

It is a super-2 number, since 2×1273012660² = 3241122465040551200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1273012661) 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, 520507 + ... + 522946.

It is an arithmetic number, because the mean of its divisors is an integer number (113214759).

Almost surely, 2^1273012660 is an apocalyptic number.

1273012660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1273012660 is an abundant number, since it is smaller than the sum of its proper divisors (1444141556).

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

1273012660 is a wasteful number, since it uses less digits than its factorization.

1273012660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043523 (or 1043521 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 1273012660 is about 35679.3029640435. The cubic root of 1273012660 is about 1083.7877574961.

The spelling of 1273012660 in words is "one billion, two hundred seventy-three million, twelve thousand, six hundred sixty".