745643019 has 12 divisors (see below), whose sum is σ = 1092788648. Its totient is φ = 451904640.

The previous prime is 745643009. The next prime is 745643021. The reversal of 745643019 is 910346547.

It is not a de Polignac number, because 745643019 - 2¹¹ = 745640971 is a prime.

It is a super-2 number, since 2×745643019² = 1111967023566868722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (745643009) 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, 1026694 + ... + 1027419.

Almost surely, 2^745643019 is an apocalyptic number.

745643019 is a deficient number, since it is larger than the sum of its proper divisors (347145629).

745643019 is a wasteful number, since it uses less digits than its factorization.

745643019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2054138 (or 2054127 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 745643019 is about 27306.4647840031. The cubic root of 745643019 is about 906.7975096065.

The spelling of 745643019 in words is "seven hundred forty-five million, six hundred forty-three thousand, nineteen".