71828905 has 8 divisors (see below), whose sum is σ = 86272200. Its totient is φ = 57411456.

The previous prime is 71828899. The next prime is 71828909. The reversal of 71828905 is 50982817.

It can be written as a sum of positive squares in 4 ways, for example, as 51108201 + 20720704 = 7149^2 + 4552^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71828905 - 2⁷ = 71828777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71828909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301 + ... + 11989.

It is an arithmetic number, because the mean of its divisors is an integer number (10784025).

Almost surely, 2^71828905 is an apocalyptic number.

It is an amenable number.

71828905 is a deficient number, since it is larger than the sum of its proper divisors (14443295).

71828905 is a wasteful number, since it uses less digits than its factorization.

71828905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12923.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 71828905 is about 8475.1935081153. The cubic root of 71828905 is about 415.6869736671.

The spelling of 71828905 in words is "seventy-one million, eight hundred twenty-eight thousand, nine hundred five".