320748757 has 6 divisors (see below), whose sum is σ = 373115958. Its totient is φ = 274927464.

The previous prime is 320748719. The next prime is 320748761. The reversal of 320748757 is 757847023.

It can be written as a sum of positive squares in only one way, i.e., 212401476 + 108347281 = 14574^2 + 10409^2 .

It is not a de Polignac number, because 320748757 - 2¹¹ = 320746709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320748767) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3272898 + ... + 3272995.

It is an arithmetic number, because the mean of its divisors is an integer number (62185993).

Almost surely, 2^320748757 is an apocalyptic number.

It is an amenable number.

320748757 is a deficient number, since it is larger than the sum of its proper divisors (52367201).

320748757 is an equidigital number, since it uses as much as digits as its factorization.

320748757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6545907 (or 6545900 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 43.

The square root of 320748757 is about 17909.4599862754. The cubic root of 320748757 is about 684.5234449771.

The spelling of 320748757 in words is "three hundred twenty million, seven hundred forty-eight thousand, seven hundred fifty-seven".