280528997761 has 16 divisors (see below), whose sum is σ = 283521097728. Its totient is φ = 277551003600.

The previous prime is 280528997753. The next prime is 280528997797. The reversal of 280528997761 is 167799825082.

It is a cyclic number.

It is not a de Polignac number, because 280528997761 - 2³ = 280528997753 is a prime.

It is a super-2 number, since 2×280528997761² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 280528997693 and 280528997702.

It is not an unprimeable number, because it can be changed into a prime (280528997261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132888096 + ... + 132890206.

It is an arithmetic number, because the mean of its divisors is an integer number (17720068608).

Almost surely, 2^280528997761 is an apocalyptic number.

It is an amenable number.

280528997761 is a deficient number, since it is larger than the sum of its proper divisors (2992099967).

280528997761 is a wasteful number, since it uses less digits than its factorization.

280528997761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4812.

The product of its (nonzero) digits is 30481920, while the sum is 64.

The spelling of 280528997761 in words is "two hundred eighty billion, five hundred twenty-eight million, nine hundred ninety-seven thousand, seven hundred sixty-one".