278498279 has 4 divisors (see below), whose sum is σ = 279200184. Its totient is φ = 277796376.

The previous prime is 278498263. The next prime is 278498287. The reversal of 278498279 is 972894872.

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 278498279 - 2⁴ = 278498263 is a prime.

It is a super-2 number, since 2×278498279² = 155122582811923682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (278498249) 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, 350357 + ... + 351150.

It is an arithmetic number, because the mean of its divisors is an integer number (69800046).

Almost surely, 2^278498279 is an apocalyptic number.

278498279 is a deficient number, since it is larger than the sum of its proper divisors (701905).

278498279 is an equidigital number, since it uses as much as digits as its factorization.

278498279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701904.

The product of its digits is 4064256, while the sum is 56.

The square root of 278498279 is about 16688.2677051874. The cubic root of 278498279 is about 653.0415865300.

The spelling of 278498279 in words is "two hundred seventy-eight million, four hundred ninety-eight thousand, two hundred seventy-nine".