745217505 has 12 divisors (see below), whose sum is σ = 1291710420. Its totient is φ = 397449312.

The previous prime is 745217489. The next prime is 745217509. The reversal of 745217505 is 505712547.

It can be written as a sum of positive squares in 2 ways, for example, as 549105489 + 196112016 = 23433^2 + 14004^2 .

It is not a de Polignac number, because 745217505 - 2⁴ = 745217489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 745217505.

It is not an unprimeable number, because it can be changed into a prime (745217509) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8280150 + ... + 8280239.

It is an arithmetic number, because the mean of its divisors is an integer number (107642535).

Almost surely, 2^745217505 is an apocalyptic number.

It is an amenable number.

745217505 is a deficient number, since it is larger than the sum of its proper divisors (546492915).

745217505 is a wasteful number, since it uses less digits than its factorization.

745217505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16560400 (or 16560397 counting only the distinct ones).

The product of its (nonzero) digits is 49000, while the sum is 36.

The square root of 745217505 is about 27298.6722204579. The cubic root of 745217505 is about 906.6249835911.

The spelling of 745217505 in words is "seven hundred forty-five million, two hundred seventeen thousand, five hundred five".