6420631 has 16 divisors (see below), whose sum is σ = 7628544. Its totient is φ = 5289984.

The previous prime is 6420599. The next prime is 6420683. The reversal of 6420631 is 1360246.

It is not a de Polignac number, because 6420631 - 2⁵ = 6420599 is a prime.

It is a super-2 number, since 2×6420631² = 82449004876322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24855 + ... + 25111.

It is an arithmetic number, because the mean of its divisors is an integer number (476784).

Almost surely, 2^6420631 is an apocalyptic number.

6420631 is a deficient number, since it is larger than the sum of its proper divisors (1207913).

6420631 is a wasteful number, since it uses less digits than its factorization.

6420631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390.

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

The square root of 6420631 is about 2533.8964067223. The cubic root of 6420631 is about 185.8628406473.

Adding to 6420631 its reverse (1360246), we get a palindrome (7780877).

The spelling of 6420631 in words is "six million, four hundred twenty thousand, six hundred thirty-one".