402728 has 8 divisors (see below), whose sum is σ = 755130. Its totient is φ = 201360.

The previous prime is 402697. The next prime is 402739. The reversal of 402728 is 827204.

It can be written as a sum of positive squares in only one way, i.e., 334084 + 68644 = 578^2 + 262^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25163 + ... + 25178.

2⁴⁰²⁷²⁸ is an apocalyptic number.

It is an amenable number.

402728 is a deficient number, since it is larger than the sum of its proper divisors (352402).

402728 is a wasteful number, since it uses less digits than its factorization.

402728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50347 (or 50343 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 402728 is about 634.6085407556. The cubic root of 402728 is about 73.8477512564.

The spelling of 402728 in words is "four hundred two thousand, seven hundred twenty-eight".