1280769252 has 72 divisors (see below), whose sum is σ = 3659372640. Its totient is φ = 346671360.

The previous prime is 1280769229. The next prime is 1280769323. The reversal of 1280769252 is 2529670821.

It is a Harshad number since it is a multiple of its sum of digits (42).

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 23 ways as a sum of consecutive naturals, for example, 46149 + ... + 68492.

It is an arithmetic number, because the mean of its divisors is an integer number (50824620).

Almost surely, 2^1280769252 is an apocalyptic number.

1280769252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1280769252 is an abundant number, since it is smaller than the sum of its proper divisors (2378603388).

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

1280769252 is a wasteful number, since it uses less digits than its factorization.

1280769252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114681 (or 114672 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 1280769252 is about 35787.8366487833. The cubic root of 1280769252 is about 1085.9845104947.

The spelling of 1280769252 in words is "one billion, two hundred eighty million, seven hundred sixty-nine thousand, two hundred fifty-two".