278481671 has 4 divisors (see below), whose sum is σ = 299903352. Its totient is φ = 257059992.

The previous prime is 278481661. The next prime is 278481701. The reversal of 278481671 is 176184872.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278481671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278481661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10710821 + ... + 10710846.

It is an arithmetic number, because the mean of its divisors is an integer number (74975838).

Almost surely, 2^278481671 is an apocalyptic number.

278481671 is a deficient number, since it is larger than the sum of its proper divisors (21421681).

278481671 is a wasteful number, since it uses less digits than its factorization.

278481671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21421680.

The product of its digits is 150528, while the sum is 44.

The square root of 278481671 is about 16687.7701026830. The cubic root of 278481671 is about 653.0286050850.

The spelling of 278481671 in words is "two hundred seventy-eight million, four hundred eighty-one thousand, six hundred seventy-one".