877649 has 4 divisors (see below), whose sum is σ = 879540. Its totient is φ = 875760.

The previous prime is 877621. The next prime is 877651. The reversal of 877649 is 946778.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 322624 + 555025 = 568^2 + 745^2 .

It is a cyclic number.

It is not a de Polignac number, because 877649 - 2¹² = 873553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (877609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287 + ... + 1355.

It is an arithmetic number, because the mean of its divisors is an integer number (219885).

2⁸⁷⁷⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

877649 is a deficient number, since it is larger than the sum of its proper divisors (1891).

877649 is a wasteful number, since it uses less digits than its factorization.

877649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1890.

The product of its digits is 84672, while the sum is 41.

The square root of 877649 is about 936.8292267004. The cubic root of 877649 is about 95.7429829406.

The spelling of 877649 in words is "eight hundred seventy-seven thousand, six hundred forty-nine".