72249999 has 8 divisors (see below), whose sum is σ = 96378672. Its totient is φ = 48144000.

The previous prime is 72249997. The next prime is 72250001. The reversal of 72249999 is 99994227.

It is a happy number.

It is a Cunningham number, because it is equal to 8500²-1.

It is an interprime number because it is at equal distance from previous prime (72249997) and next prime (72250001).

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

It is not a de Polignac number, because 72249999 - 2¹ = 72249997 is a prime.

72249999 is a modest number, since divided by 9999 gives 7224 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72249997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4249 + ... + 12749.

It is an arithmetic number, because the mean of its divisors is an integer number (12047334).

Almost surely, 2^72249999 is an apocalyptic number.

72249999 is a deficient number, since it is larger than the sum of its proper divisors (24128673).

72249999 is a wasteful number, since it uses less digits than its factorization.

72249999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11337.

The product of its digits is 734832, while the sum is 51.

The square root of 72249999 is about 8499.9999411765. Note that the first 4 decimals coincide. The cubic root of 72249999 is about 416.4977073536.

It can be divided in two parts, 722 and 49999, that added together give a triangular number (50721 = T₃₁₈).

The spelling of 72249999 in words is "seventy-two million, two hundred forty-nine thousand, nine hundred ninety-nine".