247798864 has 10 divisors (see below), whose sum is σ = 480110330. Its totient is φ = 123899424.

The previous prime is 247798861. The next prime is 247798867. The reversal of 247798864 is 468897742.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (247798861) and next prime (247798867).

It can be written as a sum of positive squares in only one way, i.e., 131331600 + 116467264 = 11460^2 + 10792^2 .

It is a super-2 number, since 2×247798864² = 122808553999380992, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247798861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7743699 + ... + 7743730.

It is an arithmetic number, because the mean of its divisors is an integer number (48011033).

Almost surely, 2^247798864 is an apocalyptic number.

It is an amenable number.

247798864 is a deficient number, since it is larger than the sum of its proper divisors (232311466).

247798864 is a wasteful number, since it uses less digits than its factorization.

247798864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15487437 (or 15487431 counting only the distinct ones).

The product of its digits is 5419008, while the sum is 55.

The square root of 247798864 is about 15741.6283782841. The cubic root of 247798864 is about 628.1062338032.

The spelling of 247798864 in words is "two hundred forty-seven million, seven hundred ninety-eight thousand, eight hundred sixty-four".