660457 has 4 divisors (see below), whose sum is σ = 754816. Its totient is φ = 566100.

The previous prime is 660449. The next prime is 660493. The reversal of 660457 is 754066.

660457 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 660457 - 2³ = 660449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660157) 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, 47169 + ... + 47182.

It is an arithmetic number, because the mean of its divisors is an integer number (188704).

2⁶⁶⁰⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

660457 is a deficient number, since it is larger than the sum of its proper divisors (94359).

660457 is an equidigital number, since it uses as much as digits as its factorization.

660457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94358.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 660457 is about 812.6850558488. The cubic root of 660457 is about 87.0859677833.

The spelling of 660457 in words is "six hundred sixty thousand, four hundred fifty-seven".