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878 = 2439

878 has 4 divisors (see below), whose sum is σ = 1320. Its totient is φ = 438.

The previous prime is 877. The next prime is 881.

878 is nontrivially palindromic in base 10.

878 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

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

It is an alternating number because its digits alternate between even and odd.

878 is an undulating number in base 10.

It is a plaindrome in base 8, base 14 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 218 + ... + 221.

It is an arithmetic number, because the mean of its divisors is an integer number (330).

878 is a deficient number, since it is larger than the sum of its proper divisors (442).

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

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

The sum of its prime factors is 441.

The product of its digits is 448, while the sum is 23.

The square root of 878 is about 29.6310647801. The cubic root of 878 is about 9.5755744803.

Adding to 878 its product of digits (448), we get a triangular number (1326 = T51).

It can be divided in two parts, 87 and 8, that multiplied together give a palindrome (696).

The spelling of 878 in words is "eight hundred seventy-eight", and thus it is an aban number and an oban number.

Divisors: 1 2 439 878