320742621 has 12 divisors (see below), whose sum is σ = 490547772. Its totient is φ = 201250176.

The previous prime is 320742599. The next prime is 320742661. The reversal of 320742621 is 126247023.

320742621 is a `hidden beast` number, since 32 + 0 + 7 + 4 + 2 + 621 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 220522500 + 100220121 = 14850^2 + 10011^2 .

It is not a de Polignac number, because 320742621 - 2⁶ = 320742557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320742661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1048026 + ... + 1048331.

It is an arithmetic number, because the mean of its divisors is an integer number (40878981).

Almost surely, 2^320742621 is an apocalyptic number.

It is an amenable number.

320742621 is a deficient number, since it is larger than the sum of its proper divisors (169805151).

320742621 is a wasteful number, since it uses less digits than its factorization.

320742621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2096380 (or 2096377 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 320742621 is about 17909.2886793418. The cubic root of 320742621 is about 684.5190799171.

Adding to 320742621 its reverse (126247023), we get a palindrome (446989644).

The spelling of 320742621 in words is "three hundred twenty million, seven hundred forty-two thousand, six hundred twenty-one".