6446286440 has 64 divisors (see below), whose sum is σ = 16753469760. Its totient is φ = 2206213120.

The previous prime is 6446286439. The next prime is 6446286443. The reversal of 6446286440 is 446826446.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 6446286391 and 6446286400.

It is not an unprimeable number, because it can be changed into a prime (6446286443) 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, 423422 + ... + 438381.

It is an arithmetic number, because the mean of its divisors is an integer number (261772965).

Almost surely, 2^6446286440 is an apocalyptic number.

It is an amenable number.

6446286440 is an abundant number, since it is smaller than the sum of its proper divisors (10307183320).

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

6446286440 is a wasteful number, since it uses less digits than its factorization.

6446286440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861842 (or 861838 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 44.

The square root of 6446286440 is about 80288.7690776238. The cubic root of 6446286440 is about 1861.1006743155.

The spelling of 6446286440 in words is "six billion, four hundred forty-six million, two hundred eighty-six thousand, four hundred forty".