72017900 has 18 divisors (see below), whose sum is σ = 156279060. Its totient is φ = 28807120.

The previous prime is 72017893. The next prime is 72017903. The reversal of 72017900 is 971027.

It is a self number, because there is not a number n which added to its sum of digits gives 72017900.

It is not an unprimeable number, because it can be changed into a prime (72017903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 359990 + ... + 360189.

It is an arithmetic number, because the mean of its divisors is an integer number (8682170).

Almost surely, 2^72017900 is an apocalyptic number.

It is an amenable number.

72017900 is an abundant number, since it is smaller than the sum of its proper divisors (84261160).

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

72017900 is a wasteful number, since it uses less digits than its factorization.

72017900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720193 (or 720186 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 26.

The square root of 72017900 is about 8486.3360763053. The cubic root of 72017900 is about 416.0512372171.

Adding to 72017900 its reverse (971027), we get a palindrome (72988927).

The spelling of 72017900 in words is "seventy-two million, seventeen thousand, nine hundred".