6464840 has 32 divisors (see below), whose sum is σ = 15180480. Its totient is φ = 2473152.

The previous prime is 6464831. The next prime is 6464849. The reversal of 6464840 is 484646.

It is an interprime number because it is at equal distance from previous prime (6464831) and next prime (6464849).

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 6464797 and 6464806.

It is not an unprimeable number, because it can be changed into a prime (6464849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2594 + ... + 4433.

It is an arithmetic number, because the mean of its divisors is an integer number (474390).

Almost surely, 2^6464840 is an apocalyptic number.

It is an amenable number.

6464840 is an abundant number, since it is smaller than the sum of its proper divisors (8715640).

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

6464840 is a wasteful number, since it uses less digits than its factorization.

6464840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7061 (or 7057 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 6464840 is about 2542.6049634184. The cubic root of 6464840 is about 186.2884490385.

The spelling of 6464840 in words is "six million, four hundred sixty-four thousand, eight hundred forty".