247428 has 48 divisors (see below), whose sum is σ = 672000. Its totient is φ = 78624.

The previous prime is 247421. The next prime is 247433. The reversal of 247428 is 824742.

It is a super-2 number, since 2×247428² = 122441230368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (247421) by changing a digit.

247428 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 15 ways as a sum of consecutive naturals, for example, 3093 + ... + 3171.

It is an arithmetic number, because the mean of its divisors is an integer number (14000).

2²⁴⁷⁴²⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 247428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (336000).

247428 is an abundant number, since it is smaller than the sum of its proper divisors (424572).

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

247428 is a wasteful number, since it uses less digits than its factorization.

247428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 113 counting only the distinct ones).

The product of its digits is 3584, while the sum is 27.

The square root of 247428 is about 497.4213505671. The cubic root of 247428 is about 62.7792729142.

The spelling of 247428 in words is "two hundred forty-seven thousand, four hundred twenty-eight".