668552 has 16 divisors (see below), whose sum is σ = 1262940. Its totient is φ = 331776.

The previous prime is 668543. The next prime is 668567. The reversal of 668552 is 255866.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 586756 + 81796 = 766^2 + 286^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1328 + ... + 1760.

2⁶⁶⁸⁵⁵² is an apocalyptic number.

It is an amenable number.

668552 is a deficient number, since it is larger than the sum of its proper divisors (594388).

668552 is a wasteful number, since it uses less digits than its factorization.

668552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632 (or 628 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

The square root of 668552 is about 817.6502919953. The cubic root of 668552 is about 87.4403184857.

Subtracting from 668552 its reverse (255866), we obtain a triangular number (412686 = T₉₀₈).

The spelling of 668552 in words is "six hundred sixty-eight thousand, five hundred fifty-two".