278479966 has 8 divisors (see below), whose sum is σ = 420054120. Its totient is φ = 138461928.

The previous prime is 278479933. The next prime is 278479973. The reversal of 278479966 is 669974872.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×278479966² = 155102182926722312, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 278479966.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388581 + ... + 389296.

It is an arithmetic number, because the mean of its divisors is an integer number (52506765).

Almost surely, 2^278479966 is an apocalyptic number.

278479966 is a deficient number, since it is larger than the sum of its proper divisors (141574154).

278479966 is a wasteful number, since it uses less digits than its factorization.

278479966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778058.

The product of its digits is 9144576, while the sum is 58.

The square root of 278479966 is about 16687.7190172893. The cubic root of 278479966 is about 653.0272723628.

The spelling of 278479966 in words is "two hundred seventy-eight million, four hundred seventy-nine thousand, nine hundred sixty-six".