72451985 has 4 divisors (see below), whose sum is σ = 86942388. Its totient is φ = 57961584.

The previous prime is 72451979. The next prime is 72451993. The reversal of 72451985 is 58915427.

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 56896849 + 15555136 = 7543^2 + 3944^2 .

It is a cyclic number.

It is not a de Polignac number, because 72451985 - 2⁴ = 72451969 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7245194 + ... + 7245203.

It is an arithmetic number, because the mean of its divisors is an integer number (21735597).

Almost surely, 2^72451985 is an apocalyptic number.

It is an amenable number.

72451985 is a deficient number, since it is larger than the sum of its proper divisors (14490403).

72451985 is a wasteful number, since it uses less digits than its factorization.

72451985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14490402.

The product of its digits is 100800, while the sum is 41.

The square root of 72451985 is about 8511.8731780966. The cubic root of 72451985 is about 416.8854740537.

The spelling of 72451985 in words is "seventy-two million, four hundred fifty-one thousand, nine hundred eighty-five".