620865 has 48 divisors (see below), whose sum is σ = 1292928. Its totient is φ = 279936.

The previous prime is 620849. The next prime is 620869. The reversal of 620865 is 568026.

It is not a de Polignac number, because 620865 - 2⁴ = 620849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (620869) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8469 + ... + 8541.

It is an arithmetic number, because the mean of its divisors is an integer number (26936).

2⁶²⁰⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

620865 is an abundant number, since it is smaller than the sum of its proper divisors (672063).

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

620865 is an equidigital number, since it uses as much as digits as its factorization.

620865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 620865 is about 787.9498715020. The cubic root of 620865 is about 85.3098266280.

It can be divided in two parts, 620 and 865, that added together give a triangular number (1485 = T₅₄).

The spelling of 620865 in words is "six hundred twenty thousand, eight hundred sixty-five".