280378 has 12 divisors (see below), whose sum is σ = 489402. Its totient is φ = 120120.

The previous prime is 280373. The next prime is 280409. The reversal of 280378 is 873082.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 233289 + 47089 = 483^2 + 217^2 .

It is a super-2 number, since 2×280378² = 157223645768, which contains 22 as substring.

280378 is a modest number, since divided by 378 gives 280 as remainder.

It is not an unprimeable number, because it can be changed into a prime (280373) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1333 + ... + 1528.

2²⁸⁰³⁷⁸ is an apocalyptic number.

280378 is a deficient number, since it is larger than the sum of its proper divisors (209024).

280378 is a wasteful number, since it uses less digits than its factorization.

280378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2877 (or 2870 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 280378 is about 529.5073181742. The cubic root of 280378 is about 65.4507525627.

Subtracting 280378 from its reverse (873082), we obtain a cube (592704 = 84³).

The spelling of 280378 in words is "two hundred eighty thousand, three hundred seventy-eight".