670605 has 32 divisors (see below), whose sum is σ = 1223040. Its totient is φ = 311040.

The previous prime is 670597. The next prime is 670613. The reversal of 670605 is 506076.

670605 = T₂₁₄ + T₂₁₅ + ... + T₂₃₉.

It is an interprime number because it is at equal distance from previous prime (670597) and next prime (670613).

It is not a de Polignac number, because 670605 - 2³ = 670597 is a prime.

It is a super-2 number, since 2×670605² = 899422132050, which contains 22 as substring.

670605 is a lucky number.

It is a congruent number.

It is an unprimeable 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 31 ways as a sum of consecutive naturals, for example, 3615 + ... + 3795.

It is an arithmetic number, because the mean of its divisors is an integer number (38220).

2⁶⁷⁰⁶⁰⁵ is an apocalyptic number.

670605 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

670605 is a deficient number, since it is larger than the sum of its proper divisors (552435).

670605 is a wasteful number, since it uses less digits than its factorization.

670605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 670605 is about 818.9047563667. The cubic root of 670605 is about 87.5297313931.

It can be divided in two parts, 670 and 605, that added together give a triangular number (1275 = T₅₀).

The spelling of 670605 in words is "six hundred seventy thousand, six hundred five".