6457990 has 32 divisors (see below), whose sum is σ = 14494464. Its totient is φ = 2012640.

The previous prime is 6457987. The next prime is 6457991. The reversal of 6457990 is 997546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6457991) 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, 3424 + ... + 4963.

It is an arithmetic number, because the mean of its divisors is an integer number (452952).

Almost surely, 2^6457990 is an apocalyptic number.

6457990 is an abundant number, since it is smaller than the sum of its proper divisors (8036474).

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

6457990 is a wasteful number, since it uses less digits than its factorization.

6457990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8412.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 6457990 is about 2541.2575627039. The cubic root of 6457990 is about 186.2226300937. Note that the first 3 decimals are identical.

It can be divided in two parts, 6457 and 990, that added together give a palindrome (7447).

The spelling of 6457990 in words is "six million, four hundred fifty-seven thousand, nine hundred ninety".