51966778 has 8 divisors (see below), whose sum is σ = 78401268. Its totient is φ = 25833024.

The previous prime is 51966769. The next prime is 51966781. The reversal of 51966778 is 87766915.

It can be written as a sum of positive squares in 2 ways, for example, as 51739249 + 227529 = 7193^2 + 477^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74751 + ... + 75442.

Almost surely, 2^51966778 is an apocalyptic number.

51966778 is a deficient number, since it is larger than the sum of its proper divisors (26434490).

51966778 is a wasteful number, since it uses less digits than its factorization.

51966778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150368.

The product of its digits is 635040, while the sum is 49.

The square root of 51966778 is about 7208.7986516479. The cubic root of 51966778 is about 373.1716106160.

The spelling of 51966778 in words is "fifty-one million, nine hundred sixty-six thousand, seven hundred seventy-eight".