71720516 has 36 divisors (see below), whose sum is σ = 153694800. Its totient is φ = 29118096.

The previous prime is 71720513. The next prime is 71720531. The reversal of 71720516 is 61502717.

It is not an unprimeable number, because it can be changed into a prime (71720513) 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 11 ways as a sum of consecutive naturals, for example, 5906 + ... + 13353.

It is an arithmetic number, because the mean of its divisors is an integer number (4269300).

Almost surely, 2^71720516 is an apocalyptic number.

71720516 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

71720516 is an abundant number, since it is smaller than the sum of its proper divisors (81974284).

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

71720516 is a wasteful number, since it uses less digits than its factorization.

71720516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19296 (or 19287 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 71720516 is about 8468.7966087278. The cubic root of 71720516 is about 415.4777794374.

The spelling of 71720516 in words is "seventy-one million, seven hundred twenty thousand, five hundred sixteen".