72391985 has 8 divisors (see below), whose sum is σ = 88718976. Its totient is φ = 56681200.

The previous prime is 72391939. The next prime is 72391987. The reversal of 72391985 is 58919327.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72391985 - 2²² = 68197681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72391987) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 153791 + ... + 154260.

It is an arithmetic number, because the mean of its divisors is an integer number (11089872).

Almost surely, 2^72391985 is an apocalyptic number.

It is an amenable number.

72391985 is a deficient number, since it is larger than the sum of its proper divisors (16326991).

72391985 is a wasteful number, since it uses less digits than its factorization.

72391985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308103.

The product of its digits is 136080, while the sum is 44.

The square root of 72391985 is about 8508.3479595042. The cubic root of 72391985 is about 416.7703631685.

The spelling of 72391985 in words is "seventy-two million, three hundred ninety-one thousand, nine hundred eighty-five".