740640 has 48 divisors (see below), whose sum is σ = 2334528. Its totient is φ = 197376.

The previous prime is 740603. The next prime is 740651. The reversal of 740640 is 46047.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

740640 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 292 + ... + 1251.

It is an arithmetic number, because the mean of its divisors is an integer number (48636).

2⁷⁴⁰⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

740640 is an abundant number, since it is smaller than the sum of its proper divisors (1593888).

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

740640 is a wasteful number, since it uses less digits than its factorization.

740640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561 (or 1553 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 740640 is about 860.6044387522. The cubic root of 740640 is about 90.4764852472.

Adding to 740640 its reverse (46047), we get a palindrome (786687).

The spelling of 740640 in words is "seven hundred forty thousand, six hundred forty".