745640 has 32 divisors (see below), whose sum is σ = 1918080. Its totient is φ = 255552.

The previous prime is 745631. The next prime is 745649. The reversal of 745640 is 46547.

It is an interprime number because it is at equal distance from previous prime (745631) and next prime (745649).

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1052 + ... + 1611.

It is an arithmetic number, because the mean of its divisors is an integer number (59940).

2⁷⁴⁵⁶⁴⁰ is an apocalyptic number.

745640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

745640 is an abundant number, since it is smaller than the sum of its proper divisors (1172440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

745640 is a wasteful number, since it uses less digits than its factorization.

745640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2681 (or 2677 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 745640 is about 863.5044875390. The cubic root of 745640 is about 90.6796285775.

The spelling of 745640 in words is "seven hundred forty-five thousand, six hundred forty".