670815 has 16 divisors (see below), whose sum is σ = 1192800. Its totient is φ = 357696.

The previous prime is 670811. The next prime is 670823. The reversal of 670815 is 518076.

It is not a de Polignac number, because 670815 - 2² = 670811 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 670815.

It is not an unprimeable number, because it can be changed into a prime (670811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2350 + ... + 2619.

It is an arithmetic number, because the mean of its divisors is an integer number (74550).

2⁶⁷⁰⁸¹⁵ is an apocalyptic number.

670815 is a deficient number, since it is larger than the sum of its proper divisors (521985).

670815 is a wasteful number, since it uses less digits than its factorization.

670815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4983 (or 4977 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 670815 is about 819.0329663695. The cubic root of 670815 is about 87.5388670866.

It can be divided in two parts, 670 and 815, that added together give a triangular number (1485 = T₅₄).

The spelling of 670815 in words is "six hundred seventy thousand, eight hundred fifteen".