7987478 has 4 divisors (see below), whose sum is σ = 11981220. Its totient is φ = 3993738.

The previous prime is 7987477. The next prime is 7987481. The reversal of 7987478 is 8747897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8747897 = 577 ⋅15161.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7987477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1996868 + ... + 1996871.

It is an arithmetic number, because the mean of its divisors is an integer number (2995305).

Almost surely, 2^7987478 is an apocalyptic number.

7987478 is a deficient number, since it is larger than the sum of its proper divisors (3993742).

7987478 is a wasteful number, since it uses less digits than its factorization.

7987478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3993741.

The product of its digits is 790272, while the sum is 50.

The square root of 7987478 is about 2826.2126600806. The cubic root of 7987478 is about 199.8955955080.

The spelling of 7987478 in words is "seven million, nine hundred eighty-seven thousand, four hundred seventy-eight".