815428 has 6 divisors (see below), whose sum is σ = 1427006. Its totient is φ = 407712.

The previous prime is 815417. The next prime is 815431. The reversal of 815428 is 824518.

It can be written as a sum of positive squares in only one way, i.e., 492804 + 322624 = 702^2 + 568^2 .

It is a junction number, because it is equal to n+sod(n) for n = 815396 and 815405.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101925 + ... + 101932.

2⁸¹⁵⁴²⁸ is an apocalyptic number.

It is an amenable number.

815428 is a deficient number, since it is larger than the sum of its proper divisors (611578).

815428 is a wasteful number, since it uses less digits than its factorization.

815428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203861 (or 203859 counting only the distinct ones).

The product of its digits is 2560, while the sum is 28.

The square root of 815428 is about 903.0105204260. The cubic root of 815428 is about 93.4247347244.

The spelling of 815428 in words is "eight hundred fifteen thousand, four hundred twenty-eight".