320660649 has 27 divisors (see below), whose sum is σ = 476996637. Its totient is φ = 207577944.

The previous prime is 320660597. The next prime is 320660651. The reversal of 320660649 is 946066023.

The square root of 320660649 is 17907.

It is a perfect power (a square), and thus also a powerful number.

320660649 is a `hidden beast` number, since 3 + 2 + 0 + 6 + 6 + 0 + 649 = 666.

It is not a de Polignac number, because 320660649 - 2¹¹ = 320658601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (320660689) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2524824 + ... + 2524950.

Almost surely, 2^320660649 is an apocalyptic number.

320660649 is the 17907-th square number.

320660649 is the 8954-th centered octagonal number.

It is an amenable number.

320660649 is a deficient number, since it is larger than the sum of its proper divisors (156335988).

320660649 is an equidigital number, since it uses as much as digits as its factorization.

320660649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The cubic root of 320660649 is about 684.4607609046.

Multiplying 320660649 by its sum of digits (36), we get a square (11543783364 = 107442²).

Multiplying 320660649 by its product of nonzero digits (46656), we get a square (14960743239744 = 3867912²).

It can be divided in two parts, 320 and 660649, that added together give a square (660969 = 813²).

The spelling of 320660649 in words is "three hundred twenty million, six hundred sixty thousand, six hundred forty-nine".