278468491 has 4 divisors (see below), whose sum is σ = 318249712. Its totient is φ = 238687272.

The previous prime is 278468479. The next prime is 278468497. The reversal of 278468491 is 194864872.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 278468491 - 2⁵ = 278468459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (278468497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19890600 + ... + 19890613.

It is an arithmetic number, because the mean of its divisors is an integer number (79562428).

Almost surely, 2^278468491 is an apocalyptic number.

278468491 is a deficient number, since it is larger than the sum of its proper divisors (39781221).

278468491 is an equidigital number, since it uses as much as digits as its factorization.

278468491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39781220.

The product of its digits is 774144, while the sum is 49.

The square root of 278468491 is about 16687.3751980352. The cubic root of 278468491 is about 653.0183027279.

The spelling of 278468491 in words is "two hundred seventy-eight million, four hundred sixty-eight thousand, four hundred ninety-one".