72349987 has 4 divisors (see below), whose sum is σ = 72523080. Its totient is φ = 72176896.

The previous prime is 72349933. The next prime is 72349993. The reversal of 72349987 is 78994327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78994327 = 53 ⋅1490459.

It is a cyclic number.

It is not a de Polignac number, because 72349987 - 2¹¹ = 72347939 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72349987.

It is not an unprimeable number, because it can be changed into a prime (72349787) 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, 85918 + ... + 86755.

It is an arithmetic number, because the mean of its divisors is an integer number (18130770).

Almost surely, 2^72349987 is an apocalyptic number.

72349987 is a deficient number, since it is larger than the sum of its proper divisors (173093).

72349987 is a wasteful number, since it uses less digits than its factorization.

72349987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173092.

The product of its digits is 762048, while the sum is 49.

The square root of 72349987 is about 8505.8795547551. The cubic root of 72349987 is about 416.6897515388.

The spelling of 72349987 in words is "seventy-two million, three hundred forty-nine thousand, nine hundred eighty-seven".