278490967 has 4 divisors (see below), whose sum is σ = 281046040. Its totient is φ = 275935896.

The previous prime is 278490959. The next prime is 278491001. The reversal of 278490967 is 769094872.

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 278490967 - 2³ = 278490959 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 (278490907) 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, 1277373 + ... + 1277590.

It is an arithmetic number, because the mean of its divisors is an integer number (70261510).

Almost surely, 2^278490967 is an apocalyptic number.

278490967 is a deficient number, since it is larger than the sum of its proper divisors (2555073).

278490967 is a wasteful number, since it uses less digits than its factorization.

278490967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2555072.

The product of its (nonzero) digits is 1524096, while the sum is 52.

The square root of 278490967 is about 16688.0486276856. The cubic root of 278490967 is about 653.0358712560.

The spelling of 278490967 in words is "two hundred seventy-eight million, four hundred ninety thousand, nine hundred sixty-seven".