987428 has 24 divisors (see below), whose sum is σ = 1972152. Its totient is φ = 428544.

The previous prime is 987391. The next prime is 987433. The reversal of 987428 is 824789.

It can be written as a sum of positive squares in 4 ways, for example, as 3364 + 984064 = 58^2 + 992^2 .

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 987391 and 987400.

It is an unprimeable number.

987428 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 7 ways as a sum of consecutive naturals, for example, 326 + ... + 1442.

It is an arithmetic number, because the mean of its divisors is an integer number (82173).

2⁹⁸⁷⁴²⁸ is an apocalyptic number.

It is an amenable number.

987428 is a deficient number, since it is larger than the sum of its proper divisors (984724).

987428 is a wasteful number, since it uses less digits than its factorization.

987428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151 (or 1149 counting only the distinct ones).

The product of its digits is 32256, while the sum is 38.

The square root of 987428 is about 993.6941179256. The cubic root of 987428 is about 99.5791647950.

The spelling of 987428 in words is "nine hundred eighty-seven thousand, four hundred twenty-eight".