71742661 has 8 divisors (see below), whose sum is σ = 73715544. Its totient is φ = 69780480.

The previous prime is 71742659. The next prime is 71742677. The reversal of 71742661 is 16624717.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4601025 + 67141636 = 2145^2 + 8194^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 71742661 - 2¹ = 71742659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71742641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11995 + ... + 16951.

It is an arithmetic number, because the mean of its divisors is an integer number (9214443).

Almost surely, 2^71742661 is an apocalyptic number.

It is an amenable number.

71742661 is a deficient number, since it is larger than the sum of its proper divisors (1972883).

71742661 is a wasteful number, since it uses less digits than its factorization.

71742661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5351.

The product of its digits is 14112, while the sum is 34.

The square root of 71742661 is about 8470.1039544978. The cubic root of 71742661 is about 415.5205371174.

The spelling of 71742661 in words is "seventy-one million, seven hundred forty-two thousand, six hundred sixty-one".