280894480645 has 16 divisors (see below), whose sum is σ = 343218794688. Its totient is φ = 220640492160.

The previous prime is 280894480619. The next prime is 280894480697. The reversal of 280894480645 is 546084498082.

It is a happy number.

It is not a de Polignac number, because 280894480645 - 2¹¹ = 280894478597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 280894480645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1262776 + ... + 1468465.

It is an arithmetic number, because the mean of its divisors is an integer number (21451174668).

Almost surely, 2^280894480645 is an apocalyptic number.

It is an amenable number.

280894480645 is a deficient number, since it is larger than the sum of its proper divisors (62324314043).

280894480645 is a wasteful number, since it uses less digits than its factorization.

280894480645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2731620.

The product of its (nonzero) digits is 17694720, while the sum is 58.

The spelling of 280894480645 in words is "two hundred eighty billion, eight hundred ninety-four million, four hundred eighty thousand, six hundred forty-five".