320756640 has 48 divisors (see below), whose sum is σ = 1010384928. Its totient is φ = 85534976.

The previous prime is 320756633. The next prime is 320756647. The reversal of 320756640 is 46657023.

It is an interprime number because it is at equal distance from previous prime (320756633) and next prime (320756647).

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

It is not an unprimeable number, because it can be changed into a prime (320756647) 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, 333642 + ... + 334601.

It is an arithmetic number, because the mean of its divisors is an integer number (21049686).

Almost surely, 2^320756640 is an apocalyptic number.

320756640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

320756640 is an abundant number, since it is smaller than the sum of its proper divisors (689628288).

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

320756640 is a wasteful number, since it uses less digits than its factorization.

320756640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668261 (or 668253 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 320756640 is about 17909.6800641441. The cubic root of 320756640 is about 684.5290527453.

The spelling of 320756640 in words is "three hundred twenty million, seven hundred fifty-six thousand, six hundred forty".