71507661 has 16 divisors (see below), whose sum is σ = 102340224. Its totient is φ = 44250624.

The previous prime is 71507617. The next prime is 71507663. The reversal of 71507661 is 16670517.

It is not a de Polignac number, because 71507661 - 2²³ = 63119053 is a prime.

It is a super-2 number, since 2×71507661² = 10226691163381842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71507663) 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 15 ways as a sum of consecutive naturals, for example, 5881 + ... + 13326.

It is an arithmetic number, because the mean of its divisors is an integer number (6396264).

Almost surely, 2^71507661 is an apocalyptic number.

It is an amenable number.

71507661 is a deficient number, since it is larger than the sum of its proper divisors (30832563).

71507661 is a wasteful number, since it uses less digits than its factorization.

71507661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19300.

The product of its (nonzero) digits is 8820, while the sum is 33.

The square root of 71507661 is about 8456.2202549366. The cubic root of 71507661 is about 415.0663483217.

The spelling of 71507661 in words is "seventy-one million, five hundred seven thousand, six hundred sixty-one".