72868991 has 8 divisors (see below), whose sum is σ = 81886560. Its totient is φ = 64338912.

The previous prime is 72868963. The next prime is 72869023. The reversal of 72868991 is 19986827.

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

It is not a de Polignac number, because 72868991 - 2¹⁴ = 72852607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72868091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121556 + ... + 122153.

It is an arithmetic number, because the mean of its divisors is an integer number (10235820).

Almost surely, 2^72868991 is an apocalyptic number.

72868991 is a deficient number, since it is larger than the sum of its proper divisors (9017569).

72868991 is a wasteful number, since it uses less digits than its factorization.

72868991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243745.

The product of its digits is 435456, while the sum is 50.

The square root of 72868991 is about 8536.3335806422. Note that the first 3 decimals coincide. The cubic root of 72868991 is about 417.6837557492.

The spelling of 72868991 in words is "seventy-two million, eight hundred sixty-eight thousand, nine hundred ninety-one".