278648087 has 4 divisors (see below), whose sum is σ = 279207000. Its totient is φ = 278089176.

The previous prime is 278648039. The next prime is 278648093. The reversal of 278648087 is 780846872.

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 278648087 - 2⁶ = 278648023 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 (278648387) 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, 278708 + ... + 279705.

It is an arithmetic number, because the mean of its divisors is an integer number (69801750).

Almost surely, 2^278648087 is an apocalyptic number.

278648087 is a deficient number, since it is larger than the sum of its proper divisors (558913).

278648087 is an equidigital number, since it uses as much as digits as its factorization.

278648087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558912.

The product of its (nonzero) digits is 1204224, while the sum is 50.

The square root of 278648087 is about 16692.7555244783. The cubic root of 278648087 is about 653.1586588485.

The spelling of 278648087 in words is "two hundred seventy-eight million, six hundred forty-eight thousand, eighty-seven".