505228428 has 30 divisors (see below), whose sum is σ = 1320767756. Its totient is φ = 168409368.

The previous prime is 505228391. The next prime is 505228429. The reversal of 505228428 is 824822505.

505228428 is a `hidden beast` number, since 5 + 0 + 5 + 228 + 428 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 505228392 and 505228401.

It is not an unprimeable number, because it can be changed into a prime (505228429) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 779350 + ... + 779997.

Almost surely, 2^505228428 is an apocalyptic number.

It is an amenable number.

505228428 is an abundant number, since it is smaller than the sum of its proper divisors (815539328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

505228428 is a wasteful number, since it uses less digits than its factorization.

505228428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559363 (or 1559352 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 36.

The square root of 505228428 is about 22477.2869359271. The cubic root of 505228428 is about 796.4574758916.

The spelling of 505228428 in words is "five hundred five million, two hundred twenty-eight thousand, four hundred twenty-eight".