6466440 has 32 divisors (see below), whose sum is σ = 19399680. Its totient is φ = 1724352.

The previous prime is 6466433. The next prime is 6466457. The reversal of 6466440 is 446646.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 6466398 and 6466407.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26824 + ... + 27063.

It is an arithmetic number, because the mean of its divisors is an integer number (606240).

Almost surely, 2^6466440 is an apocalyptic number.

6466440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6466440 is an abundant number, since it is smaller than the sum of its proper divisors (12933240).

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

6466440 is a wasteful number, since it uses less digits than its factorization.

6466440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53901 (or 53897 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 6466440 is about 2542.9195818979. The cubic root of 6466440 is about 186.3038161078.

The spelling of 6466440 in words is "six million, four hundred sixty-six thousand, four hundred forty".