72201973 has 4 divisors (see below), whose sum is σ = 72686700. Its totient is φ = 71717248.

The previous prime is 72201937. The next prime is 72202001. The reversal of 72201973 is 37910227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37910227 = 4007 ⋅9461.

It can be written as a sum of positive squares in 2 ways, for example, as 26801329 + 45400644 = 5177^2 + 6738^2 .

It is a cyclic number.

It is not a de Polignac number, because 72201973 - 2⁹ = 72201461 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 (72201923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242140 + ... + 242437.

It is an arithmetic number, because the mean of its divisors is an integer number (18171675).

Almost surely, 2^72201973 is an apocalyptic number.

It is an amenable number.

72201973 is a deficient number, since it is larger than the sum of its proper divisors (484727).

72201973 is a wasteful number, since it uses less digits than its factorization.

72201973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484726.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 72201973 is about 8497.1744127092. The cubic root of 72201973 is about 416.4054021501.

The spelling of 72201973 in words is "seventy-two million, two hundred one thousand, nine hundred seventy-three".