247681485 has 12 divisors (see below), whose sum is σ = 429314652. Its totient is φ = 132096768.

The previous prime is 247681471. The next prime is 247681501. The reversal of 247681485 is 584186742.

247681485 is a `hidden beast` number, since 24 + 76 + 81 + 485 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 102454884 + 145226601 = 10122^2 + 12051^2 .

It is not a de Polignac number, because 247681485 - 2⁵ = 247681453 is a prime.

It is a super-2 number, since 2×247681485² = 122692236023610450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 5504033 = 247681485 / (2 + 4 + 7 + 6 + 8 + 1 + 4 + 8 + 5).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 247681485.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2751972 + ... + 2752061.

It is an arithmetic number, because the mean of its divisors is an integer number (35776221).

Almost surely, 2^247681485 is an apocalyptic number.

It is an amenable number.

247681485 is a deficient number, since it is larger than the sum of its proper divisors (181633167).

247681485 is a wasteful number, since it uses less digits than its factorization.

247681485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5504044 (or 5504041 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The square root of 247681485 is about 15737.8996374993. The cubic root of 247681485 is about 628.0070429721.

The spelling of 247681485 in words is "two hundred forty-seven million, six hundred eighty-one thousand, four hundred eighty-five".