51777775 has 12 divisors (see below), whose sum is σ = 73376752. Its totient is φ = 35504640.

The previous prime is 51777743. The next prime is 51777779. The reversal of 51777775 is 57777715.

51777775 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51777775 - 2⁵ = 51777743 is a prime.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51777779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147762 + ... + 148111.

Almost surely, 2^51777775 is an apocalyptic number.

51777775 is a deficient number, since it is larger than the sum of its proper divisors (21598977).

51777775 is a wasteful number, since it uses less digits than its factorization.

51777775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295890 (or 295885 counting only the distinct ones).

The product of its digits is 420175, while the sum is 46.

The square root of 51777775 is about 7195.6775219572. The cubic root of 51777775 is about 372.7186530644.

The spelling of 51777775 in words is "fifty-one million, seven hundred seventy-seven thousand, seven hundred seventy-five".