72890045 has 4 divisors (see below), whose sum is σ = 87468060. Its totient is φ = 58312032.

The previous prime is 72890039. The next prime is 72890047. The reversal of 72890045 is 54009827.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19731364 + 53158681 = 4442^2 + 7291^2 .

It is a cyclic number.

It is not a de Polignac number, because 72890045 - 2¹² = 72885949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72889987 and 72890014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72890047) 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, 7289000 + ... + 7289009.

It is an arithmetic number, because the mean of its divisors is an integer number (21867015).

Almost surely, 2^72890045 is an apocalyptic number.

It is an amenable number.

72890045 is a deficient number, since it is larger than the sum of its proper divisors (14578015).

72890045 is a wasteful number, since it uses less digits than its factorization.

72890045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14578014.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 72890045 is about 8537.5666908083. The cubic root of 72890045 is about 417.7239789263.

The spelling of 72890045 in words is "seventy-two million, eight hundred ninety thousand, forty-five".