6450640 has 40 divisors (see below), whose sum is σ = 17141760. Its totient is φ = 2211456.

The previous prime is 6450637. The next prime is 6450641. The reversal of 6450640 is 460546.

6450640 = 194² + 195² + ... + 298².

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×6450640² = 83221512819200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6450641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5200 + ... + 6319.

It is an arithmetic number, because the mean of its divisors is an integer number (428544).

Almost surely, 2^6450640 is an apocalyptic number.

It is an amenable number.

6450640 is an abundant number, since it is smaller than the sum of its proper divisors (10691120).

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

6450640 is a wasteful number, since it uses less digits than its factorization.

6450640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11539 (or 11533 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 6450640 is about 2539.8110165916. The cubic root of 6450640 is about 186.1519550630.

It can be divided in two parts, 64506 and 40, that added together give a palindrome (64546).

The spelling of 6450640 in words is "six million, four hundred fifty thousand, six hundred forty".