71534990 has 16 divisors (see below), whose sum is σ = 129151152. Its totient is φ = 28527744.

The previous prime is 71534977. The next prime is 71534993. The reversal of 71534990 is 9943517.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71534993) 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, 7244 + ... + 13983.

It is an arithmetic number, because the mean of its divisors is an integer number (8071947).

Almost surely, 2^71534990 is an apocalyptic number.

71534990 is a deficient number, since it is larger than the sum of its proper divisors (57616162).

71534990 is a wasteful number, since it uses less digits than its factorization.

71534990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21571.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 71534990 is about 8457.8360116522. The cubic root of 71534990 is about 415.1192186636.

The spelling of 71534990 in words is "seventy-one million, five hundred thirty-four thousand, nine hundred ninety".