678457 has 4 divisors (see below), whose sum is σ = 730660. Its totient is φ = 626256.

The previous prime is 678451. The next prime is 678463. The reversal of 678457 is 754876.

It is a happy number.

678457 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.

It is an interprime number because it is at equal distance from previous prime (678451) and next prime (678463).

It can be written as a sum of positive squares in 2 ways, for example, as 32041 + 646416 = 179^2 + 804^2 .

It is a cyclic number.

It is not a de Polignac number, because 678457 - 2⁷ = 678329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678451) 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, 26082 + ... + 26107.

It is an arithmetic number, because the mean of its divisors is an integer number (182665).

2⁶⁷⁸⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

678457 is a deficient number, since it is larger than the sum of its proper divisors (52203).

678457 is a wasteful number, since it uses less digits than its factorization.

678457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52202.

The product of its digits is 47040, while the sum is 37.

The square root of 678457 is about 823.6850126110. The cubic root of 678457 is about 87.8700302458.

The spelling of 678457 in words is "six hundred seventy-eight thousand, four hundred fifty-seven".