280623123 has 20 divisors (see below), whose sum is σ = 457313208. Its totient is φ = 170074080.

The previous prime is 280623107. The next prime is 280623143. The reversal of 280623123 is 321326082.

280623123 is a `hidden beast` number, since 28 + 0 + 623 + 12 + 3 = 666.

It is not a de Polignac number, because 280623123 - 2⁴ = 280623107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (280623143) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 156586 + ... + 158367.

Almost surely, 2^280623123 is an apocalyptic number.

280623123 is a deficient number, since it is larger than the sum of its proper divisors (176690085).

280623123 is a wasteful number, since it uses less digits than its factorization.

280623123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314976 (or 314967 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 280623123 is about 16751.8095440463. The cubic root of 280623123 is about 654.6982064422.

The spelling of 280623123 in words is "two hundred eighty million, six hundred twenty-three thousand, one hundred twenty-three".