51775478 has 4 divisors (see below), whose sum is σ = 77663220. Its totient is φ = 25887738.

The previous prime is 51775463. The next prime is 51775501. The reversal of 51775478 is 87457715.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12943868 + ... + 12943871.

It is an arithmetic number, because the mean of its divisors is an integer number (19415805).

Almost surely, 2^51775478 is an apocalyptic number.

51775478 is a deficient number, since it is larger than the sum of its proper divisors (25887742).

51775478 is a wasteful number, since it uses less digits than its factorization.

51775478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25887741.

The product of its digits is 274400, while the sum is 44.

The square root of 51775478 is about 7195.5179104773. The cubic root of 51775478 is about 372.7131413855.

The spelling of 51775478 in words is "fifty-one million, seven hundred seventy-five thousand, four hundred seventy-eight".