745402609 has 4 divisors (see below), whose sum is σ = 851888704. Its totient is φ = 638916516.

The previous prime is 745402583. The next prime is 745402627. The reversal of 745402609 is 906204547.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 745402609 - 2¹⁷ = 745271537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (745402639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53243037 + ... + 53243050.

It is an arithmetic number, because the mean of its divisors is an integer number (212972176).

Almost surely, 2^745402609 is an apocalyptic number.

It is an amenable number.

745402609 is a deficient number, since it is larger than the sum of its proper divisors (106486095).

745402609 is a wasteful number, since it uses less digits than its factorization.

745402609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106486094.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 745402609 is about 27302.0623579978. The cubic root of 745402609 is about 906.7000426697.

The spelling of 745402609 in words is "seven hundred forty-five million, four hundred two thousand, six hundred nine".