51493278 has 8 divisors (see below), whose sum is σ = 102986568. Its totient is φ = 17164424.

The previous prime is 51493271. The next prime is 51493279. The reversal of 51493278 is 87239415.

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

51493278 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51493271) 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, 4291101 + ... + 4291112.

It is an arithmetic number, because the mean of its divisors is an integer number (12873321).

Almost surely, 2^51493278 is an apocalyptic number.

51493278 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51493278 is a wasteful number, since it uses less digits than its factorization.

51493278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8582218.

The product of its digits is 60480, while the sum is 39.

The square root of 51493278 is about 7175.8816879879. The cubic root of 51493278 is about 372.0347551064.

The spelling of 51493278 in words is "fifty-one million, four hundred ninety-three thousand, two hundred seventy-eight".