71489690 has 16 divisors (see below), whose sum is σ = 129186792. Its totient is φ = 28483584.

The previous prime is 71489683. The next prime is 71489699. The reversal of 71489690 is 9698417.

It can be written as a sum of positive squares in 4 ways, for example, as 70744921 + 744769 = 8411^2 + 863^2 .

It is a super-2 number, since 2×71489690² = 10221551552592200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71489699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11339 + ... + 16478.

Almost surely, 2^71489690 is an apocalyptic number.

71489690 is a deficient number, since it is larger than the sum of its proper divisors (57697102).

71489690 is a wasteful number, since it uses less digits than its factorization.

71489690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28081.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 71489690 is about 8455.1575975850. The cubic root of 71489690 is about 415.0315745077.

The spelling of 71489690 in words is "seventy-one million, four hundred eighty-nine thousand, six hundred ninety".