320750661 has 32 divisors (see below), whose sum is σ = 536832000. Its totient is φ = 165487680.

The previous prime is 320750659. The next prime is 320750681. The reversal of 320750661 is 166057023.

It is not a de Polignac number, because 320750661 - 2¹ = 320750659 is a prime.

It is a super-3 number, since 3×320750661³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320750621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29760 + ... + 39078.

It is an arithmetic number, because the mean of its divisors is an integer number (16776000).

Almost surely, 2^320750661 is an apocalyptic number.

It is an amenable number.

320750661 is a deficient number, since it is larger than the sum of its proper divisors (216081339).

320750661 is a wasteful number, since it uses less digits than its factorization.

320750661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9489.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 320750661 is about 17909.5131424615. The cubic root of 320750661 is about 684.5247994433.

The spelling of 320750661 in words is "three hundred twenty million, seven hundred fifty thousand, six hundred sixty-one".