71712990 has 48 divisors (see below), whose sum is σ = 186878016. Its totient is φ = 19080000.

The previous prime is 71712967. The next prime is 71712997. The reversal of 71712990 is 9921717.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71712997) 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 23 ways as a sum of consecutive naturals, for example, 67060 + ... + 68120.

It is an arithmetic number, because the mean of its divisors is an integer number (3893292).

Almost surely, 2^71712990 is an apocalyptic number.

71712990 is an abundant number, since it is smaller than the sum of its proper divisors (115165026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71712990 is a wasteful number, since it uses less digits than its factorization.

71712990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825 (or 1822 counting only the distinct ones).

The product of its (nonzero) digits is 7938, while the sum is 36.

The square root of 71712990 is about 8468.3522600326. The cubic root of 71712990 is about 415.4632461940.

The spelling of 71712990 in words is "seventy-one million, seven hundred twelve thousand, nine hundred ninety".