280871955 has 80 divisors (see below), whose sum is σ = 619760064. Its totient is φ = 118506240.

The previous prime is 280871951. The next prime is 280871957. The reversal of 280871955 is 559178082.

It is a happy number.

It is not a de Polignac number, because 280871955 - 2² = 280871951 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 280871955.

It is not an unprimeable number, because it can be changed into a prime (280871951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 33045 + ... + 40665.

Almost surely, 2^280871955 is an apocalyptic number.

280871955 is an abundant number, since it is smaller than the sum of its proper divisors (338888109).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

280871955 is a wasteful number, since it uses less digits than its factorization.

280871955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7658 (or 7649 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 45.

The square root of 280871955 is about 16759.2349169048. The cubic root of 280871955 is about 654.8916589449.

The spelling of 280871955 in words is "two hundred eighty million, eight hundred seventy-one thousand, nine hundred fifty-five".