247123728 has 120 divisors (see below), whose sum is σ = 746098080. Its totient is φ = 76101120.

The previous prime is 247123717. The next prime is 247123729. The reversal of 247123728 is 827321742.

It is a super-2 number, since 2×247123728² = 122140273881235968, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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 = 247123692 and 247123701.

It is not an unprimeable number, because it can be changed into a prime (247123729) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 111075 + ... + 113277.

It is an arithmetic number, because the mean of its divisors is an integer number (6217484).

Almost surely, 2^247123728 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 247123728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (373049040).

247123728 is an abundant number, since it is smaller than the sum of its proper divisors (498974352).

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

247123728 is a wasteful number, since it uses less digits than its factorization.

247123728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2277 (or 2268 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 247123728 is about 15720.1694647354. The cubic root of 247123728 is about 627.5352830645.

The spelling of 247123728 in words is "two hundred forty-seven million, one hundred twenty-three thousand, seven hundred twenty-eight".