620988 has 12 divisors (see below), whose sum is σ = 1449000. Its totient is φ = 206992.

The previous prime is 620981. The next prime is 620999. The reversal of 620988 is 889026.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×620988² = 771252192288, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620981) 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, 25863 + ... + 25886.

It is an arithmetic number, because the mean of its divisors is an integer number (120750).

2⁶²⁰⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

620988 is an abundant number, since it is smaller than the sum of its proper divisors (828012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

620988 is a wasteful number, since it uses less digits than its factorization.

620988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51756 (or 51754 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 620988 is about 788.0279182872. The cubic root of 620988 is about 85.3154598525.

The spelling of 620988 in words is "six hundred twenty thousand, nine hundred eighty-eight".