71520761 has 8 divisors (see below), whose sum is σ = 77200200. Its totient is φ = 65866752.

The previous prime is 71520737. The next prime is 71520767. The reversal of 71520761 is 16702517.

It can be written as a sum of positive squares in 4 ways, for example, as 4280761 + 67240000 = 2069^2 + 8200^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71520761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71520767) 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 7 ways as a sum of consecutive naturals, for example, 290 + ... + 11963.

It is an arithmetic number, because the mean of its divisors is an integer number (9650025).

Almost surely, 2^71520761 is an apocalyptic number.

It is an amenable number.

71520761 is a deficient number, since it is larger than the sum of its proper divisors (5679439).

71520761 is a wasteful number, since it uses less digits than its factorization.

71520761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12715.

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 71520761 is about 8456.9947972078. The cubic root of 71520761 is about 415.0916930986.

The spelling of 71520761 in words is "seventy-one million, five hundred twenty thousand, seven hundred sixty-one".