620881 has 4 divisors (see below), whose sum is σ = 624292. Its totient is φ = 617472.

The previous prime is 620869. The next prime is 620887. The reversal of 620881 is 188026.

620881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 370881 + 250000 = 609^2 + 500^2 .

It is a cyclic number.

It is not a de Polignac number, because 620881 - 2⁵ = 620849 is a prime.

It is a super-2 number, since 2×620881² = 770986432322, which contains 22 as substring.

It is a Duffinian number.

620881 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (620887) 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, 1416 + ... + 1801.

It is an arithmetic number, because the mean of its divisors is an integer number (156073).

2⁶²⁰⁸⁸¹ is an apocalyptic number.

It is an amenable number.

620881 is a deficient number, since it is larger than the sum of its proper divisors (3411).

620881 is a wasteful number, since it uses less digits than its factorization.

620881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3410.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 620881 is about 787.9600243667. The cubic root of 620881 is about 85.3105594472.

The spelling of 620881 in words is "six hundred twenty thousand, eight hundred eighty-one".