545978 has 4 divisors (see below), whose sum is σ = 818970. Its totient is φ = 272988.

The previous prime is 545959. The next prime is 546001. The reversal of 545978 is 879545.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 879545 = 5 ⋅175909.

It can be written as a sum of positive squares in only one way, i.e., 543169 + 2809 = 737^2 + 53^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 136493 + ... + 136496.

2⁵⁴⁵⁹⁷⁸ is an apocalyptic number.

545978 is a deficient number, since it is larger than the sum of its proper divisors (272992).

545978 is a wasteful number, since it uses less digits than its factorization.

545978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272991.

The product of its digits is 50400, while the sum is 38.

The square root of 545978 is about 738.9032412975. The cubic root of 545978 is about 81.7319224836.

The spelling of 545978 in words is "five hundred forty-five thousand, nine hundred seventy-eight".