620864 has 28 divisors (see below), whose sum is σ = 1257300. Its totient is φ = 304128.

The previous prime is 620849. The next prime is 620869. The reversal of 620864 is 468026.

It can be written as a sum of positive squares in 2 ways, for example, as 270400 + 350464 = 520^2 + 592^2 .

It is a plaindrome in base 9.

It is a congruent number.

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

620864 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5642 + ... + 5750.

2⁶²⁰⁸⁶⁴ is an apocalyptic number.

620864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (628650).

620864 is an abundant number, since it is smaller than the sum of its proper divisors (636436).

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

620864 is a wasteful number, since it uses less digits than its factorization.

620864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 620864 is about 787.9492369436. The cubic root of 620864 is about 85.3097808264.

The spelling of 620864 in words is "six hundred twenty thousand, eight hundred sixty-four".