802780 has 48 divisors (see below), whose sum is σ = 1905120. Its totient is φ = 281600.

The previous prime is 802777. The next prime is 802783. The reversal of 802780 is 87208.

It is an interprime number because it is at equal distance from previous prime (802777) and next prime (802783).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (802783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8976 + ... + 9064.

It is an arithmetic number, because the mean of its divisors is an integer number (39690).

2⁸⁰²⁷⁸⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 802780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (952560).

802780 is an abundant number, since it is smaller than the sum of its proper divisors (1102340).

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

802780 is a wasteful number, since it uses less digits than its factorization.

802780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 802780 is about 895.9799104891. The cubic root of 802780 is about 92.9391824977.

Adding to 802780 its reverse (87208), we get a palindrome (889988).

The spelling of 802780 in words is "eight hundred two thousand, seven hundred eighty".