663428 has 6 divisors (see below), whose sum is σ = 1161006. Its totient is φ = 331712.

The previous prime is 663409. The next prime is 663437. The reversal of 663428 is 824366.

663428 is an esthetic number in base 7, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in only one way, i.e., 369664 + 293764 = 608^2 + 542^2 .

It is a super-2 number, since 2×663428² = 880273422368, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 663428.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82925 + ... + 82932.

It is an arithmetic number, because the mean of its divisors is an integer number (193501).

2⁶⁶³⁴²⁸ is an apocalyptic number.

It is an amenable number.

663428 is a deficient number, since it is larger than the sum of its proper divisors (497578).

663428 is a wasteful number, since it uses less digits than its factorization.

663428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165861 (or 165859 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 663428 is about 814.5108961825. The cubic root of 663428 is about 87.2163549830.

The spelling of 663428 in words is "six hundred sixty-three thousand, four hundred twenty-eight".