51819705 has 72 divisors (see below), whose sum is σ = 106277184. Its totient is φ = 23284800.

The previous prime is 51819697. The next prime is 51819731. The reversal of 51819705 is 50791815.

It is not a de Polignac number, because 51819705 - 2³ = 51819697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51819705.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 156390 + ... + 156720.

It is an arithmetic number, because the mean of its divisors is an integer number (1476072).

Almost surely, 2^51819705 is an apocalyptic number.

It is an amenable number.

51819705 is an abundant number, since it is smaller than the sum of its proper divisors (54457479).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51819705 is a wasteful number, since it uses less digits than its factorization.

51819705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427 (or 417 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 36.

The square root of 51819705 is about 7198.5904870329. The cubic root of 51819705 is about 372.8192359654.

The spelling of 51819705 in words is "fifty-one million, eight hundred nineteen thousand, seven hundred five".