51709705 has 16 divisors (see below), whose sum is σ = 64512000. Its totient is φ = 39746880.

The previous prime is 51709703. The next prime is 51709711. The reversal of 51709705 is 50790715.

It is a happy number.

It is not a de Polignac number, because 51709705 - 2¹ = 51709703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51709703) 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, 21976 + ... + 24214.

It is an arithmetic number, because the mean of its divisors is an integer number (4032000).

Almost surely, 2^51709705 is an apocalyptic number.

It is an amenable number.

51709705 is a deficient number, since it is larger than the sum of its proper divisors (12802295).

51709705 is a wasteful number, since it uses less digits than its factorization.

51709705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2424.

The product of its (nonzero) digits is 11025, while the sum is 34.

The square root of 51709705 is about 7190.9460434633. The cubic root of 51709705 is about 372.5552490758. Note that the first 3 decimals are identical.

The spelling of 51709705 in words is "fifty-one million, seven hundred nine thousand, seven hundred five".