280400255 has 8 divisors (see below), whose sum is σ = 337435632. Its totient is φ = 223683328.

The previous prime is 280400231. The next prime is 280400279. The reversal of 280400255 is 552004082.

It is an interprime number because it is at equal distance from previous prime (280400231) and next prime (280400279).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280400255 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77669 + ... + 81198.

It is an arithmetic number, because the mean of its divisors is an integer number (42179454).

Almost surely, 2^280400255 is an apocalyptic number.

280400255 is a deficient number, since it is larger than the sum of its proper divisors (57035377).

280400255 is a wasteful number, since it uses less digits than its factorization.

280400255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159225.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 280400255 is about 16745.1561652915. The cubic root of 280400255 is about 654.5248423439.

The spelling of 280400255 in words is "two hundred eighty million, four hundred thousand, two hundred fifty-five".