658669 has 4 divisors (see below), whose sum is σ = 718560. Its totient is φ = 598780.

The previous prime is 658663. The next prime is 658681. The reversal of 658669 is 966856.

658669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 658669 - 2¹³ = 650477 is a prime.

It is a super-2 number, since 2×658669² = 867689703122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

658669 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (658663) 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, 29929 + ... + 29950.

It is an arithmetic number, because the mean of its divisors is an integer number (179640).

2⁶⁵⁸⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

658669 is a deficient number, since it is larger than the sum of its proper divisors (59891).

658669 is a wasteful number, since it uses less digits than its factorization.

658669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59890.

The product of its digits is 77760, while the sum is 40.

The square root of 658669 is about 811.5842531740. The cubic root of 658669 is about 87.0073099068.

The spelling of 658669 in words is "six hundred fifty-eight thousand, six hundred sixty-nine".