72847405 has 4 divisors (see below), whose sum is σ = 87416892. Its totient is φ = 58277920.

The previous prime is 72847403. The next prime is 72847429. The reversal of 72847405 is 50474827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50474827 = 13 ⋅3882679.

It can be written as a sum of positive squares in 2 ways, for example, as 17464041 + 55383364 = 4179^2 + 7442^2 .

It is not a de Polignac number, because 72847405 - 2¹ = 72847403 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 (72847403) 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, 7284736 + ... + 7284745.

It is an arithmetic number, because the mean of its divisors is an integer number (21854223).

Almost surely, 2^72847405 is an apocalyptic number.

It is an amenable number.

72847405 is a deficient number, since it is larger than the sum of its proper divisors (14569487).

72847405 is a wasteful number, since it uses less digits than its factorization.

72847405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14569486.

The product of its (nonzero) digits is 62720, while the sum is 37.

The square root of 72847405 is about 8535.0691268437. The cubic root of 72847405 is about 417.6425081537.

The spelling of 72847405 in words is "seventy-two million, eight hundred forty-seven thousand, four hundred five".