280561780 has 24 divisors (see below), whose sum is σ = 608186880. Its totient is φ = 108604320.

The previous prime is 280561777. The next prime is 280561789. The reversal of 280561780 is 87165082.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280561789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225640 + ... + 226879.

It is an arithmetic number, because the mean of its divisors is an integer number (25341120).

Almost surely, 2^280561780 is an apocalyptic number.

280561780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280561780 is an abundant number, since it is smaller than the sum of its proper divisors (327625100).

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

280561780 is a wasteful number, since it uses less digits than its factorization.

280561780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452559 (or 452557 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 280561780 is about 16749.9785074489. The cubic root of 280561780 is about 654.6504982344.

The spelling of 280561780 in words is "two hundred eighty million, five hundred sixty-one thousand, seven hundred eighty".