278249490 has 192 divisors, whose sum is σ = 817689600. Its totient is φ = 65318400.

The previous prime is 278249479. The next prime is 278249527. The reversal of 278249490 is 94942872.

278249490 is a `hidden beast` number, since 2 + 78 + 2 + 494 + 90 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1537200 + ... + 1537380.

It is an arithmetic number, because the mean of its divisors is an integer number (4258800).

Almost surely, 2^278249490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 278249490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (408844800).

278249490 is an abundant number, since it is smaller than the sum of its proper divisors (539440110).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

278249490 is a wasteful number, since it uses less digits than its factorization.

278249490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273 (or 270 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 278249490 is about 16680.8120305937. The cubic root of 278249490 is about 652.8470695092.

The spelling of 278249490 in words is "two hundred seventy-eight million, two hundred forty-nine thousand, four hundred ninety".