745405643 has 8 divisors (see below), whose sum is σ = 781728000. Its totient is φ = 709409448.

The previous prime is 745405637. The next prime is 745405649. The reversal of 745405643 is 346504547.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (745405637) and next prime (745405649).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 745405643 - 2¹⁰ = 745404619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 745405597 and 745405606.

It is not an unprimeable number, because it can be changed into a prime (745405649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76853 + ... + 86006.

It is an arithmetic number, because the mean of its divisors is an integer number (97716000).

Almost surely, 2^745405643 is an apocalyptic number.

745405643 is a deficient number, since it is larger than the sum of its proper divisors (36322357).

745405643 is a wasteful number, since it uses less digits than its factorization.

745405643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163081.

The product of its (nonzero) digits is 201600, while the sum is 38.

The square root of 745405643 is about 27302.1179215093. The cubic root of 745405643 is about 906.7012728435.

The spelling of 745405643 in words is "seven hundred forty-five million, four hundred five thousand, six hundred forty-three".