51765405 has 32 divisors (see below), whose sum is σ = 89558400. Its totient is φ = 25443072.

The previous prime is 51765403. The next prime is 51765409. The reversal of 51765405 is 50456715.

51765405 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 51765405 - 2¹ = 51765403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51765401) 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 31 ways as a sum of consecutive naturals, for example, 8091 + ... + 12999.

It is an arithmetic number, because the mean of its divisors is an integer number (2798700).

Almost surely, 2^51765405 is an apocalyptic number.

It is an amenable number.

51765405 is a deficient number, since it is larger than the sum of its proper divisors (37792995).

51765405 is a wasteful number, since it uses less digits than its factorization.

51765405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4973.

The product of its (nonzero) digits is 21000, while the sum is 33.

The square root of 51765405 is about 7194.8179268137. The cubic root of 51765405 is about 372.6889691769.

The spelling of 51765405 in words is "fifty-one million, seven hundred sixty-five thousand, four hundred five".