247280945 has 8 divisors (see below), whose sum is σ = 296985960. Its totient is φ = 197658880.

The previous prime is 247280939. The next prime is 247280983. The reversal of 247280945 is 549082742.

It can be written as a sum of positive squares in 4 ways, for example, as 37957921 + 209323024 = 6161^2 + 14468^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 247280945 - 2¹⁴ = 247264561 is a prime.

It is a super-2 number, since 2×247280945² = 122295731520186050, which contains 22 as substring.

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, 13976 + ... + 26265.

It is an arithmetic number, because the mean of its divisors is an integer number (37123245).

Almost surely, 2^247280945 is an apocalyptic number.

It is an amenable number.

247280945 is a deficient number, since it is larger than the sum of its proper divisors (49705015).

247280945 is a wasteful number, since it uses less digits than its factorization.

247280945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41475.

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 247280945 is about 15725.1691564829. The cubic root of 247280945 is about 627.6683315322.

The spelling of 247280945 in words is "two hundred forty-seven million, two hundred eighty thousand, nine hundred forty-five".