745281 has 12 divisors (see below), whose sum is σ = 1116752. Its totient is φ = 496692.

The previous prime is 745273. The next prime is 745301. The reversal of 745281 is 182547.

It is not a de Polignac number, because 745281 - 2³ = 745273 is a prime.

It is a super-2 number, since 2×745281² = 1110887537922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (745201) 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 11 ways as a sum of consecutive naturals, for example, 1291 + ... + 1776.

2⁷⁴⁵²⁸¹ is an apocalyptic number.

It is an amenable number.

745281 is a deficient number, since it is larger than the sum of its proper divisors (371471).

745281 is an equidigital number, since it uses as much as digits as its factorization.

745281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3082 (or 3070 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 745281 is about 863.2965886646. The cubic root of 745281 is about 90.6650732010.

It can be divided in two parts, 74528 and 1, that added together give a square (74529 = 273²).

The spelling of 745281 in words is "seven hundred forty-five thousand, two hundred eighty-one".