6440464492 has 48 divisors (see below), whose sum is σ = 14378740992. Its totient is φ = 2450911680.

The previous prime is 6440464483. The next prime is 6440464517. The reversal of 6440464492 is 2944640446.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229903 + ... + 256390.

It is an arithmetic number, because the mean of its divisors is an integer number (299557104).

Almost surely, 2^6440464492 is an apocalyptic number.

It is an amenable number.

6440464492 is an abundant number, since it is smaller than the sum of its proper divisors (7938276500).

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

6440464492 is a wasteful number, since it uses less digits than its factorization.

6440464492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486358 (or 486356 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 43.

The square root of 6440464492 is about 80252.5045839692. The cubic root of 6440464492 is about 1860.5402227013.

The spelling of 6440464492 in words is "six billion, four hundred forty million, four hundred sixty-four thousand, four hundred ninety-two".