1280852820 has 72 divisors (see below), whose sum is σ = 4184126856. Its totient is φ = 315286272.

The previous prime is 1280852801. The next prime is 1280852821. The reversal of 1280852820 is 282580821.

It is a happy number.

1280852820 is a `hidden beast` number, since 128 + 0 + 8 + 528 + 2 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 61027344 + 1219825476 = 7812^2 + 34926^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280852821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 271347 + ... + 276026.

It is an arithmetic number, because the mean of its divisors is an integer number (58112873).

Almost surely, 2^1280852820 is an apocalyptic number.

1280852820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1280852820 is an abundant number, since it is smaller than the sum of its proper divisors (2903274036).

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

1280852820 is a wasteful number, since it uses less digits than its factorization.

1280852820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547401 (or 547396 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 1280852820 is about 35789.0041772609. The cubic root of 1280852820 is about 1086.0081295241.

The spelling of 1280852820 in words is "one billion, two hundred eighty million, eight hundred fifty-two thousand, eight hundred twenty".