6431620 has 48 divisors (see below), whose sum is σ = 15064560. Its totient is φ = 2290176.

The previous prime is 6431597. The next prime is 6431641. The reversal of 6431620 is 261346.

6431620 = 282² + 283² + ... + 346².

6431620 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 1617984 + 4813636 = 1272^2 + 2194^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6431591 and 6431600.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7114 + ... + 7966.

It is an arithmetic number, because the mean of its divisors is an integer number (313845).

Almost surely, 2^6431620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6431620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7532280).

6431620 is an abundant number, since it is smaller than the sum of its proper divisors (8632940).

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

6431620 is a wasteful number, since it uses less digits than its factorization.

6431620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904 (or 902 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 6431620 is about 2536.0638793217. The cubic root of 6431620 is about 185.9688158304.

Adding to 6431620 its reverse (261346), we get a palindrome (6692966).

It can be divided in two parts, 64 and 31620, that added together give a square (31684 = 178²).

The spelling of 6431620 in words is "six million, four hundred thirty-one thousand, six hundred twenty".