71487761 has 4 divisors (see below), whose sum is σ = 71589300. Its totient is φ = 71386224.

The previous prime is 71487751. The next prime is 71487769. The reversal of 71487761 is 16778417.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16778417 = 967 ⋅17351.

It can be written as a sum of positive squares in 2 ways, for example, as 5569600 + 65918161 = 2360^2 + 8119^2 .

It is a cyclic number.

It is not a de Polignac number, because 71487761 - 2²⁶ = 4378897 is a prime.

It is a super-2 number, since 2×71487761² = 10220999945586242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71487769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49706 + ... + 51123.

It is an arithmetic number, because the mean of its divisors is an integer number (17897325).

Almost surely, 2^71487761 is an apocalyptic number.

It is an amenable number.

71487761 is a deficient number, since it is larger than the sum of its proper divisors (101539).

71487761 is a wasteful number, since it uses less digits than its factorization.

71487761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101538.

The product of its digits is 65856, while the sum is 41.

The square root of 71487761 is about 8455.0435244297. The cubic root of 71487761 is about 415.0278415540.

The spelling of 71487761 in words is "seventy-one million, four hundred eighty-seven thousand, seven hundred sixty-one".