278488040 has 32 divisors (see below), whose sum is σ = 628425000. Its totient is φ = 111070464.

The previous prime is 278488037. The next prime is 278488043. The reversal of 278488040 is 40884872.

It is an interprime number because it is at equal distance from previous prime (278488037) and next prime (278488043).

It can be written as a sum of positive squares in 4 ways, for example, as 197739844 + 80748196 = 14062^2 + 8986^2 .

It is not an unprimeable number, because it can be changed into a prime (278488043) by changing a digit.

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, 3986 + ... + 23934.

Almost surely, 2^278488040 is an apocalyptic number.

278488040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

278488040 is an abundant number, since it is smaller than the sum of its proper divisors (349936960).

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

278488040 is a wasteful number, since it uses less digits than its factorization.

278488040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20309 (or 20305 counting only the distinct ones).

The product of its (nonzero) digits is 114688, while the sum is 41.

The square root of 278488040 is about 16687.9609299639. The cubic root of 278488040 is about 653.0335833988.

The spelling of 278488040 in words is "two hundred seventy-eight million, four hundred eighty-eight thousand, forty".