905128 has 24 divisors (see below), whose sum is σ = 1975050. Its totient is φ = 387744.

The previous prime is 905123. The next prime is 905137. The reversal of 905128 is 821509.

It can be written as a sum of positive squares in only one way, i.e., 636804 + 268324 = 798^2 + 518^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (905123) by changing a digit.

905128 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 763 + ... + 1546.

2⁹⁰⁵¹²⁸ is an apocalyptic number.

905128 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is an amenable number.

905128 is an abundant number, since it is smaller than the sum of its proper divisors (1069922).

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

905128 is a wasteful number, since it uses less digits than its factorization.

905128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2329 (or 2318 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 905128 is about 951.3821524498. The cubic root of 905128 is about 96.7319627542.

The spelling of 905128 in words is "nine hundred five thousand, one hundred twenty-eight".