247280 has 40 divisors (see below), whose sum is σ = 629424. Its totient is φ = 89600.

The previous prime is 247279. The next prime is 247301. The reversal of 247280 is 82742.

247280 = T₃₁₂ + T₃₁₃ + ... + T₃₁₆.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×247280² = 122294796800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 740 + ... + 1020.

2²⁴⁷²⁸⁰ is an apocalyptic number.

247280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 247280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (314712).

247280 is an abundant number, since it is smaller than the sum of its proper divisors (382144).

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

247280 is a wasteful number, since it uses less digits than its factorization.

247280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305 (or 299 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 247280 is about 497.2725610769. The cubic root of 247280 is about 62.7667531973.

It can be divided in two parts, 2472 and 80, that added together give a palindrome (2552).

The spelling of 247280 in words is "two hundred forty-seven thousand, two hundred eighty".