815428228 has 6 divisors (see below), whose sum is σ = 1426999406. Its totient is φ = 407714112.

The previous prime is 815428219. The next prime is 815428231. The reversal of 815428228 is 822824518.

It can be written as a sum of positive squares in only one way, i.e., 775511104 + 39917124 = 27848^2 + 6318^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101928525 + ... + 101928532.

Almost surely, 2^815428228 is an apocalyptic number.

It is an amenable number.

815428228 is a deficient number, since it is larger than the sum of its proper divisors (611571178).

815428228 is a wasteful number, since it uses less digits than its factorization.

815428228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203857061 (or 203857059 counting only the distinct ones).

The product of its digits is 81920, while the sum is 40.

The square root of 815428228 is about 28555.7039485984. The cubic root of 815428228 is about 934.2474343181.

The spelling of 815428228 in words is "eight hundred fifteen million, four hundred twenty-eight thousand, two hundred twenty-eight".