280638049861 has 8 divisors (see below), whose sum is σ = 303657943904. Its totient is φ = 257822777520.

The previous prime is 280638049841. The next prime is 280638049897. The reversal of 280638049861 is 168940836082.

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 280638049861 - 2¹¹ = 280638047813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280638049841) 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, 51152571 + ... + 51158056.

It is an arithmetic number, because the mean of its divisors is an integer number (37957242988).

Almost surely, 2^280638049861 is an apocalyptic number.

It is an amenable number.

280638049861 is a deficient number, since it is larger than the sum of its proper divisors (23019894043).

280638049861 is a wasteful number, since it uses less digits than its factorization.

280638049861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102310851.

The product of its (nonzero) digits is 3981312, while the sum is 55.

The spelling of 280638049861 in words is "two hundred eighty billion, six hundred thirty-eight million, forty-nine thousand, eight hundred sixty-one".