278240990 has 16 divisors (see below), whose sum is σ = 510284448. Its totient is φ = 109196256.

The previous prime is 278240951. The next prime is 278241011. The reversal of 278240990 is 99042872.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261962 + ... + 263021.

It is an arithmetic number, because the mean of its divisors is an integer number (31892778).

Almost surely, 2^278240990 is an apocalyptic number.

278240990 is a deficient number, since it is larger than the sum of its proper divisors (232043458).

278240990 is a wasteful number, since it uses less digits than its factorization.

278240990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525043.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 278240990 is about 16680.5572448884. The cubic root of 278240990 is about 652.8404216903.

The spelling of 278240990 in words is "two hundred seventy-eight million, two hundred forty thousand, nine hundred ninety".