73553945 has 4 divisors (see below), whose sum is σ = 88264740. Its totient is φ = 58843152.

The previous prime is 73553929. The next prime is 73553971. The reversal of 73553945 is 54935537.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54935537 = 2713 ⋅20249.

It can be written as a sum of positive squares in 2 ways, for example, as 13630864 + 59923081 = 3692^2 + 7741^2 .

It is a cyclic number.

It is not a de Polignac number, because 73553945 - 2⁴ = 73553929 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7355390 + ... + 7355399.

It is an arithmetic number, because the mean of its divisors is an integer number (22066185).

Almost surely, 2^73553945 is an apocalyptic number.

It is an amenable number.

73553945 is a deficient number, since it is larger than the sum of its proper divisors (14710795).

73553945 is a wasteful number, since it uses less digits than its factorization.

73553945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14710794.

The product of its digits is 283500, while the sum is 41.

The square root of 73553945 is about 8576.3596589695. The cubic root of 73553945 is about 418.9883911776.

The spelling of 73553945 in words is "seventy-three million, five hundred fifty-three thousand, nine hundred forty-five".