280890455081 has 8 divisors (see below), whose sum is σ = 284066251560. Its totient is φ = 277715097088.

The previous prime is 280890455047. The next prime is 280890455107. The reversal of 280890455081 is 180554098082.

It can be written as a sum of positive squares in 4 ways, for example, as 169133965081 + 111756490000 = 411259^2 + 334300^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 280890455081 - 2¹⁰ = 280890454057 is a prime.

It is a super-2 number, since 2×280890455081² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280890455281) 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, 1277405 + ... + 1481061.

It is an arithmetic number, because the mean of its divisors is an integer number (35508281445).

Almost surely, 2^280890455081 is an apocalyptic number.

It is an amenable number.

280890455081 is a deficient number, since it is larger than the sum of its proper divisors (3175796479).

280890455081 is a wasteful number, since it uses less digits than its factorization.

280890455081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219243.

The product of its (nonzero) digits is 921600, while the sum is 50.

The spelling of 280890455081 in words is "two hundred eighty billion, eight hundred ninety million, four hundred fifty-five thousand, eighty-one".