6447447990 has 32 divisors (see below), whose sum is σ = 17193195360. Its totient is φ = 1719319392.

The previous prime is 6447447977. The next prime is 6447448003. The reversal of 6447447990 is 997447446.

6447447990 is a `hidden beast` number, since 6 + 447 + 44 + 79 + 90 = 666.

It is an interprime number because it is at equal distance from previous prime (6447447977) and next prime (6447448003).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11939449 + ... + 11939988.

It is an arithmetic number, because the mean of its divisors is an integer number (537287355).

Almost surely, 2^6447447990 is an apocalyptic number.

6447447990 is an abundant number, since it is smaller than the sum of its proper divisors (10745747370).

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

6447447990 is a wasteful number, since it uses less digits than its factorization.

6447447990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23879453 (or 23879447 counting only the distinct ones).

The product of its (nonzero) digits is 6096384, while the sum is 54.

The square root of 6447447990 is about 80296.0023288831. The cubic root of 6447447990 is about 1861.2124509009.

The spelling of 6447447990 in words is "six billion, four hundred forty-seven million, four hundred forty-seven thousand, nine hundred ninety".