620670 has 32 divisors (see below), whose sum is σ = 1578528. Its totient is φ = 155648.

The previous prime is 620663. The next prime is 620671. The reversal of 620670 is 76026.

620670 = 60² + 61² + ... + 127².

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620671) by changing a digit.

620670 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 15 ways as a sum of consecutive naturals, for example, 99 + ... + 1118.

It is an arithmetic number, because the mean of its divisors is an integer number (49329).

2⁶²⁰⁶⁷⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (789264).

620670 is an abundant number, since it is smaller than the sum of its proper divisors (957858).

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

620670 is a wasteful number, since it uses less digits than its factorization.

620670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 620670 is about 787.8261229485. The cubic root of 620670 is about 85.3008943812.

Adding to 620670 its reverse (76026), we get a palindrome (696696).

Subtracting from 620670 its reverse (76026), we obtain a square (544644 = 738²).

The spelling of 620670 in words is "six hundred twenty thousand, six hundred seventy".