51778115 has 8 divisors (see below), whose sum is σ = 62774880. Its totient is φ = 40995072.

The previous prime is 51778109. The next prime is 51778117. The reversal of 51778115 is 51187715.

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

It is a cyclic number.

It is not a de Polignac number, because 51778115 - 2²⁴ = 35000899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51778117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52895 + ... + 53864.

It is an arithmetic number, because the mean of its divisors is an integer number (7846860).

Almost surely, 2^51778115 is an apocalyptic number.

51778115 is a deficient number, since it is larger than the sum of its proper divisors (10996765).

51778115 is a wasteful number, since it uses less digits than its factorization.

51778115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106861.

The product of its digits is 9800, while the sum is 35.

The square root of 51778115 is about 7195.7011472128. The cubic root of 51778115 is about 372.7194688846.

The spelling of 51778115 in words is "fifty-one million, seven hundred seventy-eight thousand, one hundred fifteen".