71989754 has 4 divisors (see below), whose sum is σ = 107984634. Its totient is φ = 35994876.

The previous prime is 71989751. The next prime is 71989763. The reversal of 71989754 is 45798917.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 71791729 + 198025 = 8473^2 + 445^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71989751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17997437 + ... + 17997440.

Almost surely, 2^71989754 is an apocalyptic number.

71989754 is a deficient number, since it is larger than the sum of its proper divisors (35994880).

71989754 is a wasteful number, since it uses less digits than its factorization.

71989754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35994879.

The product of its digits is 635040, while the sum is 50.

The square root of 71989754 is about 8484.6776014177. The cubic root of 71989754 is about 415.9970298420.

The spelling of 71989754 in words is "seventy-one million, nine hundred eighty-nine thousand, seven hundred fifty-four".