278490563 has 8 divisors (see below), whose sum is σ = 303710400. Its totient is φ = 253813248.

The previous prime is 278490551. The next prime is 278490571. The reversal of 278490563 is 365094872.

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

It is not a de Polignac number, because 278490563 - 2⁸ = 278490307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (278490593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134558 + ... + 136611.

It is an arithmetic number, because the mean of its divisors is an integer number (37963800).

Almost surely, 2^278490563 is an apocalyptic number.

278490563 is a deficient number, since it is larger than the sum of its proper divisors (25219837).

278490563 is a wasteful number, since it uses less digits than its factorization.

278490563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271261.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 278490563 is about 16688.0365232103. The cubic root of 278490563 is about 653.0355554748.

The spelling of 278490563 in words is "two hundred seventy-eight million, four hundred ninety thousand, five hundred sixty-three".