51385778 has 8 divisors (see below), whose sum is σ = 77177772. Its totient is φ = 25659856.

The previous prime is 51385759. The next prime is 51385783. The reversal of 51385778 is 87758315.

It can be written as a sum of positive squares in 2 ways, for example, as 46689889 + 4695889 = 6833^2 + 2167^2 .

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, 14525 + ... + 17712.

Almost surely, 2^51385778 is an apocalyptic number.

51385778 is a deficient number, since it is larger than the sum of its proper divisors (25791994).

51385778 is a wasteful number, since it uses less digits than its factorization.

51385778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33036.

The product of its digits is 235200, while the sum is 44.

The square root of 51385778 is about 7168.3874058257. The cubic root of 51385778 is about 371.7756818121.

The spelling of 51385778 in words is "fifty-one million, three hundred eighty-five thousand, seven hundred seventy-eight".