72897445 has 16 divisors (see below), whose sum is σ = 95819760. Its totient is φ = 52993024.

The previous prime is 72897431. The next prime is 72897491. The reversal of 72897445 is 54479827.

It is a Cunningham number, because it is equal to 8538²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 1004004 + 71893441 = 1002^2 + 8479^2 .

It is a cyclic number.

It is not a de Polignac number, because 72897445 - 2⁹ = 72896933 is a prime.

It is a super-5 number, since 5×72897445⁵ (a number of 41 digits) contains 55555 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72897395 and 72897404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12322 + ... + 17251.

It is an arithmetic number, because the mean of its divisors is an integer number (5988735).

Almost surely, 2^72897445 is an apocalyptic number.

It is an amenable number.

72897445 is a deficient number, since it is larger than the sum of its proper divisors (22922315).

72897445 is a wasteful number, since it uses less digits than its factorization.

72897445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29624.

The product of its digits is 564480, while the sum is 46.

The square root of 72897445 is about 8538.0000585617. Note that the first 4 decimals coincide. The cubic root of 72897445 is about 417.7381146144.

The spelling of 72897445 in words is "seventy-two million, eight hundred ninety-seven thousand, four hundred forty-five".