51782978 has 8 divisors (see below), whose sum is σ = 83649468. Its totient is φ = 23899824.

The previous prime is 51782977. The next prime is 51783001. The reversal of 51782978 is 87928715.

It can be written as a sum of positive squares in 2 ways, for example, as 51595489 + 187489 = 7183^2 + 433^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (51782977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 995801 + ... + 995852.

Almost surely, 2^51782978 is an apocalyptic number.

51782978 is a deficient number, since it is larger than the sum of its proper divisors (31866490).

51782978 is a wasteful number, since it uses less digits than its factorization.

51782978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991668.

The product of its digits is 282240, while the sum is 47.

The square root of 51782978 is about 7196.0390493660. The cubic root of 51782978 is about 372.7311371222.

The spelling of 51782978 in words is "fifty-one million, seven hundred eighty-two thousand, nine hundred seventy-eight".