7478 has 4 divisors (see below), whose sum is σ = 11220. Its totient is φ = 3738.

The previous prime is 7477. The next prime is 7481. The reversal of 7478 is 8747.

It is a semiprime because it is the product of two primes.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a plaindrome in base 9, base 11 and base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1868 + ... + 1871.

It is an arithmetic number, because the mean of its divisors is an integer number (2805).

2⁷⁴⁷⁸ is an apocalyptic number.

7478 is a deficient number, since it is larger than the sum of its proper divisors (3742).

7478 is a wasteful number, since it uses less digits than its factorization.

7478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3741.

The product of its digits is 1568, while the sum is 26.

The square root of 7478 is about 86.4754300365. The cubic root of 7478 is about 19.5551801083. Note that the first 3 decimals are identical.

The spelling of 7478 in words is "seven thousand, four hundred seventy-eight".