802645 has 8 divisors (see below), whose sum is σ = 968760. Its totient is φ = 638400.

The previous prime is 802643. The next prime is 802649. The reversal of 802645 is 546208.

802645 = 633² + 634².

It can be written as a sum of positive squares in 4 ways, for example, as 400689 + 401956 = 633^2 + 634^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 802645 - 2¹ = 802643 is a prime.

802645 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (802643) 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, 795 + ... + 1495.

It is an arithmetic number, because the mean of its divisors is an integer number (121095).

2⁸⁰²⁶⁴⁵ is an apocalyptic number.

802645 is the 634-th centered square number.

It is an amenable number.

802645 is a deficient number, since it is larger than the sum of its proper divisors (166115).

802645 is a wasteful number, since it uses less digits than its factorization.

802645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 802645 is about 895.9045708110. The cubic root of 802645 is about 92.9339724804.

It can be divided in two parts, 80 and 2645, that multiplied together give a square (211600 = 460²).

The spelling of 802645 in words is "eight hundred two thousand, six hundred forty-five".