6467790978 has 96 divisors (see below), whose sum is σ = 16135176960. Its totient is φ = 1918144800.

The previous prime is 6467790971. The next prime is 6467791009. The reversal of 6467790978 is 8790977646.

It is not an unprimeable number, because it can be changed into a prime (6467790971) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 296568 + ... + 317628.

It is an arithmetic number, because the mean of its divisors is an integer number (168074760).

Almost surely, 2^6467790978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6467790978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8067588480).

6467790978 is an abundant number, since it is smaller than the sum of its proper divisors (9667385982).

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

6467790978 is a wasteful number, since it uses less digits than its factorization.

6467790978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21141 (or 21124 counting only the distinct ones).

The product of its (nonzero) digits is 32006016, while the sum is 63.

The square root of 6467790978 is about 80422.5775388976. The cubic root of 6467790978 is about 1863.1678949198.

The spelling of 6467790978 in words is "six billion, four hundred sixty-seven million, seven hundred ninety thousand, nine hundred seventy-eight".