278981040 has 80 divisors (see below), whose sum is σ = 931377888. Its totient is φ = 68671488.

The previous prime is 278981039. The next prime is 278981041. The reversal of 278981040 is 40189872.

It is an interprime number because it is at equal distance from previous prime (278981039) and next prime (278981041).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 278981040.

It is not an unprimeable number, because it can be changed into a prime (278981041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41589 + ... + 47828.

Almost surely, 2^278981040 is an apocalyptic number.

278981040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

278981040 is an abundant number, since it is smaller than the sum of its proper divisors (652396848).

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

278981040 is a wasteful number, since it uses less digits than its factorization.

278981040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89446 (or 89440 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 278981040 is about 16702.7255260930. The cubic root of 278981040 is about 653.4187055822.

The spelling of 278981040 in words is "two hundred seventy-eight million, nine hundred eighty-one thousand, forty".