280434560 has 64 divisors (see below), whose sum is σ = 766199520. Its totient is φ = 96147456.

The previous prime is 280434551. The next prime is 280434563. The reversal of 280434560 is 65434082.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280434563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26819 + ... + 35778.

Almost surely, 2^280434560 is an apocalyptic number.

280434560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280434560 is an abundant number, since it is smaller than the sum of its proper divisors (485764960).

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

280434560 is an equidigital number, since it uses as much as digits as its factorization.

280434560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62623 (or 62611 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 280434560 is about 16746.1804600333. The cubic root of 280434560 is about 654.5515334265.

The spelling of 280434560 in words is "two hundred eighty million, four hundred thirty-four thousand, five hundred sixty".