280256378 has 4 divisors (see below), whose sum is σ = 420384570. Its totient is φ = 140128188.

The previous prime is 280256363. The next prime is 280256393. The reversal of 280256378 is 873652082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 873652082 = 2 ⋅436826041.

It is an interprime number because it is at equal distance from previous prime (280256363) and next prime (280256393).

It can be written as a sum of positive squares in only one way, i.e., 176969809 + 103286569 = 13303^2 + 10163^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70064093 + ... + 70064096.

Almost surely, 2^280256378 is an apocalyptic number.

280256378 is a deficient number, since it is larger than the sum of its proper divisors (140128192).

280256378 is a wasteful number, since it uses less digits than its factorization.

280256378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140128191.

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 280256378 is about 16740.8595358781. The cubic root of 280256378 is about 654.4128748017.

The spelling of 280256378 in words is "two hundred eighty million, two hundred fifty-six thousand, three hundred seventy-eight".