71806725 has 36 divisors (see below), whose sum is σ = 136186596. Its totient is φ = 36042240.

The previous prime is 71806723. The next prime is 71806729. The reversal of 71806725 is 52760817.

It can be written as a sum of positive squares in 6 ways, for example, as 10074276 + 61732449 = 3174^2 + 7857^2 .

It is not a de Polignac number, because 71806725 - 2¹ = 71806723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71806725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71806723) 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 35 ways as a sum of consecutive naturals, for example, 5562 + ... + 13211.

It is an arithmetic number, because the mean of its divisors is an integer number (3782961).

Almost surely, 2^71806725 is an apocalyptic number.

71806725 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

71806725 is a deficient number, since it is larger than the sum of its proper divisors (64379871).

71806725 is a wasteful number, since it uses less digits than its factorization.

71806725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18806 (or 18798 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 71806725 is about 8473.8848823901. The cubic root of 71806725 is about 415.6441826939.

The spelling of 71806725 in words is "seventy-one million, eight hundred six thousand, seven hundred twenty-five".