1280011872 has 48 divisors (see below), whose sum is σ = 3557684592. Its totient is φ = 401571840.

The previous prime is 1280011871. The next prime is 1280011879. The reversal of 1280011872 is 2781100821.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280011871) 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, 390529 + ... + 393792.

It is an arithmetic number, because the mean of its divisors is an integer number (74118429).

Almost surely, 2^1280011872 is an apocalyptic number.

1280011872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1280011872 is an abundant number, since it is smaller than the sum of its proper divisors (2277672720).

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

1280011872 is a wasteful number, since it uses less digits than its factorization.

1280011872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784351 (or 784343 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 30.

The square root of 1280011872 is about 35777.2535558558. The cubic root of 1280011872 is about 1085.7704034574.

The spelling of 1280011872 in words is "one billion, two hundred eighty million, eleven thousand, eight hundred seventy-two".