72071716 has 6 divisors (see below), whose sum is σ = 126125510. Its totient is φ = 36035856.

The previous prime is 72071711. The next prime is 72071729. The reversal of 72071716 is 61717027.

It can be written as a sum of positive squares in only one way, i.e., 70392100 + 1679616 = 8390^2 + 1296^2 .

It is not an unprimeable number, because it can be changed into a prime (72071711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9008961 + ... + 9008968.

Almost surely, 2^72071716 is an apocalyptic number.

It is an amenable number.

72071716 is a deficient number, since it is larger than the sum of its proper divisors (54053794).

72071716 is a wasteful number, since it uses less digits than its factorization.

72071716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18017933 (or 18017931 counting only the distinct ones).

The product of its (nonzero) digits is 4116, while the sum is 31.

The square root of 72071716 is about 8489.5062282797. The cubic root of 72071716 is about 416.1548440455.

The spelling of 72071716 in words is "seventy-two million, seventy-one thousand, seven hundred sixteen".