72521771 has 8 divisors (see below), whose sum is σ = 82950144. Its totient is φ = 62110440.

The previous prime is 72521753. The next prime is 72521789. The reversal of 72521771 is 17712527.

It is an interprime number because it is at equal distance from previous prime (72521753) and next prime (72521789).

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

It is not a de Polignac number, because 72521771 - 2⁶ = 72521707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72521791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6776 + ... + 13818.

It is an arithmetic number, because the mean of its divisors is an integer number (10368768).

Almost surely, 2^72521771 is an apocalyptic number.

72521771 is a deficient number, since it is larger than the sum of its proper divisors (10428373).

72521771 is a wasteful number, since it uses less digits than its factorization.

72521771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8521.

The product of its digits is 6860, while the sum is 32.

The square root of 72521771 is about 8515.9715241422. The cubic root of 72521771 is about 417.0192796075.

The spelling of 72521771 in words is "seventy-two million, five hundred twenty-one thousand, seven hundred seventy-one".