280644638061 has 8 divisors (see below), whose sum is σ = 374200710624. Its totient is φ = 187092495440.

The previous prime is 280644638059. The next prime is 280644638069. The reversal of 280644638061 is 160836446082.

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 280644638061 - 2¹ = 280644638059 is a prime.

It is a super-2 number, since 2×280644638061² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 280644638061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280644638069) 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, 811611 + ... + 1104536.

It is an arithmetic number, because the mean of its divisors is an integer number (46775088828).

Almost surely, 2^280644638061 is an apocalyptic number.

It is an amenable number.

280644638061 is a deficient number, since it is larger than the sum of its proper divisors (93556072563).

280644638061 is a wasteful number, since it uses less digits than its factorization.

280644638061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1964971.

The product of its (nonzero) digits is 1327104, while the sum is 48.

The spelling of 280644638061 in words is "two hundred eighty billion, six hundred forty-four million, six hundred thirty-eight thousand, sixty-one".