72113805 has 12 divisors (see below), whose sum is σ = 124997340. Its totient is φ = 38460672.

The previous prime is 72113791. The next prime is 72113831. The reversal of 72113805 is 50831127.

It can be written as a sum of positive squares in 2 ways, for example, as 55442916 + 16670889 = 7446^2 + 4083^2 .

It is not a de Polignac number, because 72113805 - 2¹³ = 72105613 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 801220 + ... + 801309.

It is an arithmetic number, because the mean of its divisors is an integer number (10416445).

Almost surely, 2^72113805 is an apocalyptic number.

It is an amenable number.

72113805 is a deficient number, since it is larger than the sum of its proper divisors (52883535).

72113805 is a wasteful number, since it uses less digits than its factorization.

72113805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1602540 (or 1602537 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 72113805 is about 8491.9847503396. The cubic root of 72113805 is about 416.2358380594.

The spelling of 72113805 in words is "seventy-two million, one hundred thirteen thousand, eight hundred five".