620649 has 16 divisors (see below), whose sum is σ = 931840. Its totient is φ = 408240.

The previous prime is 620647. The next prime is 620657. The reversal of 620649 is 946026.

620649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 620649 - 2¹ = 620647 is a prime.

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

It is a Duffinian number.

620649 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 620649.

It is not an unprimeable number, because it can be changed into a prime (620647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3339 + ... + 3519.

It is an arithmetic number, because the mean of its divisors is an integer number (58240).

2⁶²⁰⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

620649 is a deficient number, since it is larger than the sum of its proper divisors (311191).

620649 is a wasteful number, since it uses less digits than its factorization.

620649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317 (or 311 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 620649 is about 787.8127950218. The cubic root of 620649 is about 85.2999323354.

The spelling of 620649 in words is "six hundred twenty thousand, six hundred forty-nine".