278255761 has 9 divisors (see below), whose sum is σ = 323821161. Its totient is φ = 238404852.

The previous prime is 278255749. The next prime is 278255773. The reversal of 278255761 is 167552872.

The square root of 278255761 is 16681.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (278255749) and next prime (278255773).

It is not a de Polignac number, because 278255761 - 2⁹ = 278255249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (278255701) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 115576 + ... + 117958.

It is an arithmetic number, because the mean of its divisors is an integer number (35980129).

Almost surely, 2^278255761 is an apocalyptic number.

278255761 is the 16681-st square number.

278255761 is the 8341-st centered octagonal number.

It is an amenable number.

278255761 is a deficient number, since it is larger than the sum of its proper divisors (45565400).

278255761 is an frugal number, since it uses more digits than its factorization.

278255761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4780 (or 2390 counting only the distinct ones).

The product of its digits is 235200, while the sum is 43.

The cubic root of 278255761 is about 652.8519739485.

The spelling of 278255761 in words is "two hundred seventy-eight million, two hundred fifty-five thousand, seven hundred sixty-one".