51776945 has 16 divisors (see below), whose sum is σ = 69360192. Its totient is φ = 36778560.

The previous prime is 51776927. The next prime is 51776947. The reversal of 51776945 is 54967715.

It is not a de Polignac number, because 51776945 - 2¹² = 51772849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51776896 and 51776905.

It is not an unprimeable number, because it can be changed into a prime (51776947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8582 + ... + 13311.

It is an arithmetic number, because the mean of its divisors is an integer number (4335012).

Almost surely, 2^51776945 is an apocalyptic number.

51776945 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51776945 is a deficient number, since it is larger than the sum of its proper divisors (17583247).

51776945 is a wasteful number, since it uses less digits than its factorization.

51776945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21952.

The product of its digits is 264600, while the sum is 44.

The square root of 51776945 is about 7195.6198482132. The cubic root of 51776945 is about 372.7166614883.

The spelling of 51776945 in words is "fifty-one million, seven hundred seventy-six thousand, nine hundred forty-five".