280623 has 24 divisors (see below), whose sum is σ = 459648. Its totient is φ = 151536.

The previous prime is 280613. The next prime is 280627. The reversal of 280623 is 326082.

It is not a de Polignac number, because 280623 - 2⁴ = 280607 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 280623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280627) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3340 + ... + 3422.

It is an arithmetic number, because the mean of its divisors is an integer number (19152).

2²⁸⁰⁶²³ is an apocalyptic number.

280623 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

280623 is a deficient number, since it is larger than the sum of its proper divisors (179025).

280623 is a wasteful number, since it uses less digits than its factorization.

280623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 116 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 280623 is about 529.7386147904. The cubic root of 280623 is about 65.4698110789.

It can be divided in two parts, 280 and 623, that added together give a triangular number (903 = T₄₂).

The spelling of 280623 in words is "two hundred eighty thousand, six hundred twenty-three".