71720072 has 16 divisors (see below), whose sum is σ = 140322240. Its totient is φ = 34300816.

The previous prime is 71720057. The next prime is 71720101. The reversal of 71720072 is 27002717.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194708 + ... + 195075.

It is an arithmetic number, because the mean of its divisors is an integer number (8770140).

Almost surely, 2^71720072 is an apocalyptic number.

It is an amenable number.

71720072 is a deficient number, since it is larger than the sum of its proper divisors (68602168).

71720072 is a wasteful number, since it uses less digits than its factorization.

71720072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389812 (or 389808 counting only the distinct ones).

The product of its (nonzero) digits is 1372, while the sum is 26.

The square root of 71720072 is about 8468.7703948094. The cubic root of 71720072 is about 415.4769220699.

Adding to 71720072 its reverse (27002717), we get a palindrome (98722789).

The spelling of 71720072 in words is "seventy-one million, seven hundred twenty thousand, seventy-two".