74978 has 4 divisors (see below), whose sum is σ = 112470. Its totient is φ = 37488.

The previous prime is 74959. The next prime is 75011. The reversal of 74978 is 87947.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87947 = 31 ⋅2837.

It can be written as a sum of positive squares in only one way, i.e., 47089 + 27889 = 217^2 + 167^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18743 + ... + 18746.

2⁷⁴⁹⁷⁸ is an apocalyptic number.

74978 is a deficient number, since it is larger than the sum of its proper divisors (37492).

74978 is a wasteful number, since it uses less digits than its factorization.

74978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37491.

The product of its digits is 14112, while the sum is 35.

The square root of 74978 is about 273.8211094857. The cubic root of 74978 is about 42.1675094133.

The spelling of 74978 in words is "seventy-four thousand, nine hundred seventy-eight".