745815609 has 24 divisors (see below), whose sum is σ = 1343115072. Its totient is φ = 387436320.

The previous prime is 745815593. The next prime is 745815611. The reversal of 745815609 is 906518547.

745815609 is a `hidden beast` number, since 7 + 4 + 5 + 81 + 560 + 9 = 666.

It is not a de Polignac number, because 745815609 - 2⁴ = 745815593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (745815509) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 537414 + ... + 538799.

It is an arithmetic number, because the mean of its divisors is an integer number (55963128).

Almost surely, 2^745815609 is an apocalyptic number.

It is an amenable number.

745815609 is a deficient number, since it is larger than the sum of its proper divisors (597299463).

745815609 is a wasteful number, since it uses less digits than its factorization.

745815609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076237 (or 1076234 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The square root of 745815609 is about 27309.6248418026. The cubic root of 745815609 is about 906.8674680651.

The spelling of 745815609 in words is "seven hundred forty-five million, eight hundred fifteen thousand, six hundred nine".