851280 has 40 divisors (see below), whose sum is σ = 2639712. Its totient is φ = 226944.

The previous prime is 851273. The next prime is 851293. The reversal of 851280 is 82158.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 851280.

It is a congruent number.

It is an unprimeable number.

851280 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1534 + ... + 2013.

2⁸⁵¹²⁸⁰ is an apocalyptic number.

851280 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

851280 is an abundant number, since it is smaller than the sum of its proper divisors (1788432).

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

851280 is a wasteful number, since it uses less digits than its factorization.

851280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3563 (or 3557 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 851280 is about 922.6483620535. The cubic root of 851280 is about 94.7743490215.

The spelling of 851280 in words is "eight hundred fifty-one thousand, two hundred eighty".