1806280645 has 16 divisors (see below), whose sum is σ = 2342601072. Its totient is φ = 1329108480.

The previous prime is 1806280621. The next prime is 1806280681. The reversal of 1806280645 is 5460826081.

It can be written as a sum of positive squares in 8 ways, for example, as 128640964 + 1677639681 = 11342^2 + 40959^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1806280645 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1806280598 and 1806280607.

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, 31182 + ... + 67711.

It is an arithmetic number, because the mean of its divisors is an integer number (146412567).

Almost surely, 2^1806280645 is an apocalyptic number.

It is an amenable number.

1806280645 is a deficient number, since it is larger than the sum of its proper divisors (536320427).

1806280645 is a wasteful number, since it uses less digits than its factorization.

1806280645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99192.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 1806280645 is about 42500.3605278826. The cubic root of 1806280645 is about 1217.8535771723.

The spelling of 1806280645 in words is "one billion, eight hundred six million, two hundred eighty thousand, six hundred forty-five".