678553 has 2 divisors, whose sum is σ = 678554. Its totient is φ = 678552.

The previous prime is 678541. The next prime is 678563. The reversal of 678553 is 355876.

It is a happy number.

678553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 473344 + 205209 = 688^2 + 453^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678553 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (678533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339276 + 339277.

It is an arithmetic number, because the mean of its divisors is an integer number (339277).

2⁶⁷⁸⁵⁵³ is an apocalyptic number.

It is an amenable number.

678553 is a deficient number, since it is larger than the sum of its proper divisors (1).

678553 is an equidigital number, since it uses as much as digits as its factorization.

678553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 34.

The square root of 678553 is about 823.7432852534. The cubic root of 678553 is about 87.8741745149.

The spelling of 678553 in words is "six hundred seventy-eight thousand, five hundred fifty-three".