1280880 has 80 divisors (see below), whose sum is σ = 4419360. Its totient is φ = 340992.

The previous prime is 1280869. The next prime is 1280887. The reversal of 1280880 is 880821.

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1864 + ... + 2456.

It is an arithmetic number, because the mean of its divisors is an integer number (55242).

2^1280880 is an apocalyptic number.

1280880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1280880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2209680).

1280880 is an abundant number, since it is smaller than the sum of its proper divisors (3138480).

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

1280880 is a wasteful number, since it uses less digits than its factorization.

1280880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615 (or 603 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 1280880 is about 1131.7596918074. The cubic root of 1280880 is about 108.6015811253.

The spelling of 1280880 in words is "one million, two hundred eighty thousand, eight hundred eighty".