18217450628 has 12 divisors (see below), whose sum is σ = 34332887820. Its totient is φ = 8408054112.

The previous prime is 18217450577. The next prime is 18217450759. The reversal of 18217450628 is 82605471281.

It can be written as a sum of positive squares in 2 ways, for example, as 1359544384 + 16857906244 = 36872^2 + 129838^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175167743 + ... + 175167846.

It is an arithmetic number, because the mean of its divisors is an integer number (2861073985).

Almost surely, 2^18217450628 is an apocalyptic number.

It is an amenable number.

18217450628 is a deficient number, since it is larger than the sum of its proper divisors (16115437192).

18217450628 is a wasteful number, since it uses less digits than its factorization.

18217450628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350335606 (or 350335604 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 44.

The spelling of 18217450628 in words is "eighteen billion, two hundred seventeen million, four hundred fifty thousand, six hundred twenty-eight".