511978 has 4 divisors (see below), whose sum is σ = 767970. Its totient is φ = 255988.

The previous prime is 511963. The next prime is 511991. The reversal of 511978 is 879115.

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

It can be written as a sum of positive squares in only one way, i.e., 452929 + 59049 = 673^2 + 243^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127993 + ... + 127996.

2⁵¹¹⁹⁷⁸ is an apocalyptic number.

511978 is a deficient number, since it is larger than the sum of its proper divisors (255992).

511978 is a wasteful number, since it uses less digits than its factorization.

511978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255991.

The product of its digits is 2520, while the sum is 31.

The square root of 511978 is about 715.5263796674. The cubic root of 511978 is about 79.9988541503.

The spelling of 511978 in words is "five hundred eleven thousand, nine hundred seventy-eight".