320628377 has 4 divisors (see below), whose sum is σ = 320929380. Its totient is φ = 320327376.

The previous prime is 320628367. The next prime is 320628397. The reversal of 320628377 is 773826023.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 82882816 + 237745561 = 9104^2 + 15419^2 .

It is a cyclic number.

It is not a de Polignac number, because 320628377 - 2¹⁰ = 320627353 is a prime.

It is a super-2 number, since 2×320628377² = 205605112275308258, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 320628377.

It is not an unprimeable number, because it can be changed into a prime (320628367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148898 + ... + 151035.

It is an arithmetic number, because the mean of its divisors is an integer number (80232345).

Almost surely, 2^320628377 is an apocalyptic number.

It is an amenable number.

320628377 is a deficient number, since it is larger than the sum of its proper divisors (301003).

320628377 is a wasteful number, since it uses less digits than its factorization.

320628377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301002.

The product of its (nonzero) digits is 84672, while the sum is 38.

The square root of 320628377 is about 17906.0988771982. The cubic root of 320628377 is about 684.4377982504.

The spelling of 320628377 in words is "three hundred twenty million, six hundred twenty-eight thousand, three hundred seventy-seven".