72198089 has 6 divisors (see below), whose sum is σ = 74014794. Its totient is φ = 70384080.

The previous prime is 72198067. The next prime is 72198097. The reversal of 72198089 is 98089127.

It can be written as a sum of positive squares in only one way, i.e., 44023225 + 28174864 = 6635^2 + 5308^2 .

It is not a de Polignac number, because 72198089 - 2⁸ = 72197833 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72198029) 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, 53744 + ... + 55070.

It is an arithmetic number, because the mean of its divisors is an integer number (12335799).

Almost surely, 2^72198089 is an apocalyptic number.

It is an amenable number.

72198089 is a deficient number, since it is larger than the sum of its proper divisors (1816705).

72198089 is an frugal number, since it uses more digits than its factorization.

72198089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2695 (or 1368 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 72198089 is about 8496.9458630734. The cubic root of 72198089 is about 416.3979353754.

The spelling of 72198089 in words is "seventy-two million, one hundred ninety-eight thousand, eighty-nine".