1290266780 has 24 divisors (see below), whose sum is σ = 2955884400. Its totient is φ = 469187840.

The previous prime is 1290266767. The next prime is 1290266807. The reversal of 1290266780 is 876620921.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2932205 + ... + 2932644.

It is an arithmetic number, because the mean of its divisors is an integer number (123161850).

Almost surely, 2^1290266780 is an apocalyptic number.

1290266780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1290266780 is an abundant number, since it is smaller than the sum of its proper divisors (1665617620).

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

1290266780 is a wasteful number, since it uses less digits than its factorization.

1290266780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5864869 (or 5864867 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 1290266780 is about 35920.2836848486. The cubic root of 1290266780 is about 1088.6622704774.

The spelling of 1290266780 in words is "one billion, two hundred ninety million, two hundred sixty-six thousand, seven hundred eighty".