877428 has 18 divisors (see below), whose sum is σ = 2218034. Its totient is φ = 292464.

The previous prime is 877423. The next prime is 877463. The reversal of 877428 is 824778.

It can be written as a sum of positive squares in only one way, i.e., 685584 + 191844 = 828^2 + 438^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 24373 = 877428 / (8 + 7 + 7 + 4 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 877392 and 877401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (877423) by changing a digit.

877428 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 5 ways as a sum of consecutive naturals, for example, 12151 + ... + 12222.

2⁸⁷⁷⁴²⁸ is an apocalyptic number.

It is an amenable number.

877428 is an abundant number, since it is smaller than the sum of its proper divisors (1340606).

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

877428 is a wasteful number, since it uses less digits than its factorization.

877428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24383 (or 24378 counting only the distinct ones).

The product of its digits is 25088, while the sum is 36.

The square root of 877428 is about 936.7112682145. The cubic root of 877428 is about 95.7349459480.

Subtracting from 877428 its reverse (824778), we obtain a triangular number (52650 = T₃₂₄).

The spelling of 877428 in words is "eight hundred seventy-seven thousand, four hundred twenty-eight".