72861505 has 4 divisors (see below), whose sum is σ = 87433812. Its totient is φ = 58289200.

The previous prime is 72861491. The next prime is 72861527. The reversal of 72861505 is 50516827.

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 42523441 + 30338064 = 6521^2 + 5508^2 .

It is not a de Polignac number, because 72861505 - 2²³ = 64472897 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 7286146 + ... + 7286155.

It is an arithmetic number, because the mean of its divisors is an integer number (21858453).

Almost surely, 2^72861505 is an apocalyptic number.

It is an amenable number.

72861505 is a deficient number, since it is larger than the sum of its proper divisors (14572307).

72861505 is a wasteful number, since it uses less digits than its factorization.

72861505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14572306.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 72861505 is about 8535.8950907330. The cubic root of 72861505 is about 417.6694520532.

The spelling of 72861505 in words is "seventy-two million, eight hundred sixty-one thousand, five hundred five".