278242490 has 16 divisors (see below), whose sum is σ = 501761952. Its totient is φ = 111091344.

The previous prime is 278242483. The next prime is 278242507. The reversal of 278242490 is 94242872.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19964 + ... + 30903.

It is an arithmetic number, because the mean of its divisors is an integer number (31360122).

Almost surely, 2^278242490 is an apocalyptic number.

278242490 is a deficient number, since it is larger than the sum of its proper divisors (223519462).

278242490 is a wasteful number, since it uses less digits than its factorization.

278242490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51421.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 278242490 is about 16680.6022073545. The cubic root of 278242490 is about 652.8415948447.

The spelling of 278242490 in words is "two hundred seventy-eight million, two hundred forty-two thousand, four hundred ninety".