1287716740 has 12 divisors (see below), whose sum is σ = 2704205196. Its totient is φ = 515086688.

The previous prime is 1287716723. The next prime is 1287716767. The reversal of 1287716740 is 476177821.

It can be written as a sum of positive squares in 2 ways, for example, as 212401476 + 1075315264 = 14574^2 + 32792^2 .

It is a super-3 number, since 3×1287716740³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32192899 + ... + 32192938.

It is an arithmetic number, because the mean of its divisors is an integer number (225350433).

Almost surely, 2^1287716740 is an apocalyptic number.

1287716740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1287716740 is an abundant number, since it is smaller than the sum of its proper divisors (1416488456).

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

1287716740 is a wasteful number, since it uses less digits than its factorization.

1287716740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64385846 (or 64385844 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 43.

The square root of 1287716740 is about 35884.7703071930. The cubic root of 1287716740 is about 1087.9445989398.

The spelling of 1287716740 in words is "one billion, two hundred eighty-seven million, seven hundred sixteen thousand, seven hundred forty".