620840831 has 8 divisors (see below), whose sum is σ = 670093200. Its totient is φ = 571802112.

The previous prime is 620840791. The next prime is 620840861. The reversal of 620840831 is 138048026.

620840831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 620840831 - 2⁶ = 620840767 is a prime.

It is a super-2 number, since 2×620840831² = 770886674873541122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620840861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47345 + ... + 59018.

It is an arithmetic number, because the mean of its divisors is an integer number (83761650).

Almost surely, 2^620840831 is an apocalyptic number.

620840831 is a deficient number, since it is larger than the sum of its proper divisors (49252369).

620840831 is a wasteful number, since it uses less digits than its factorization.

620840831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106825.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 620840831 is about 24916.6777681135. The cubic root of 620840831 is about 853.0871963480.

Adding to 620840831 its reverse (138048026), we get a palindrome (758888857).

The spelling of 620840831 in words is "six hundred twenty million, eight hundred forty thousand, eight hundred thirty-one".