745647 has 8 divisors (see below), whose sum is σ = 1136256. Its totient is φ = 426072.

The previous prime is 745631. The next prime is 745649. The reversal of 745647 is 746547.

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

It is not a de Polignac number, because 745647 - 2⁴ = 745631 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17733 + ... + 17774.

It is an arithmetic number, because the mean of its divisors is an integer number (142032).

2⁷⁴⁵⁶⁴⁷ is an apocalyptic number.

745647 is a deficient number, since it is larger than the sum of its proper divisors (390609).

745647 is a wasteful number, since it uses less digits than its factorization.

745647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35517.

The product of its digits is 23520, while the sum is 33.

The square root of 745647 is about 863.5085407800. The cubic root of 745647 is about 90.6799123406.

Subtracting 745647 from its reverse (746547), we obtain a square (900 = 30²).

It can be divided in two parts, 7456 and 47, that added together give a triangular number (7503 = T₁₂₂).

The spelling of 745647 in words is "seven hundred forty-five thousand, six hundred forty-seven".