280072729 has 4 divisors (see below), whose sum is σ = 280153984. Its totient is φ = 279991476.

The previous prime is 280072699. The next prime is 280072753. The reversal of 280072729 is 927270082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 280072729 - 2¹⁵ = 280039961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280072769) 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 3 ways as a sum of consecutive naturals, for example, 35217 + ... + 42430.

It is an arithmetic number, because the mean of its divisors is an integer number (70038496).

Almost surely, 2^280072729 is an apocalyptic number.

It is an amenable number.

280072729 is a deficient number, since it is larger than the sum of its proper divisors (81255).

280072729 is an equidigital number, since it uses as much as digits as its factorization.

280072729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81254.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 280072729 is about 16735.3735841182. The cubic root of 280072729 is about 654.2699003202.

The spelling of 280072729 in words is "two hundred eighty million, seventy-two thousand, seven hundred twenty-nine".