7991478 has 24 divisors (see below), whose sum is σ = 18889416. Its totient is φ = 2421600.

The previous prime is 7991471. The next prime is 7991483. The reversal of 7991478 is 8741997.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7991471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19983 + ... + 20378.

It is an arithmetic number, because the mean of its divisors is an integer number (787059).

Almost surely, 2^7991478 is an apocalyptic number.

7991478 is an abundant number, since it is smaller than the sum of its proper divisors (10897938).

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

7991478 is a wasteful number, since it uses less digits than its factorization.

7991478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40380 (or 40377 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 7991478 is about 2826.9202323377. The cubic root of 7991478 is about 199.9289581016.

The spelling of 7991478 in words is "seven million, nine hundred ninety-one thousand, four hundred seventy-eight".