72699993 has 12 divisors (see below), whose sum is σ = 105087268. Its totient is φ = 48431520.

The previous prime is 72699989. The next prime is 72700003. The reversal of 72699993 is 39999627.

It can be written as a sum of positive squares in 2 ways, for example, as 20903184 + 51796809 = 4572^2 + 7197^2 .

It is not a de Polignac number, because 72699993 - 2² = 72699989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72699923) 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 11 ways as a sum of consecutive naturals, for example, 18171 + ... + 21807.

Almost surely, 2^72699993 is an apocalyptic number.

It is an amenable number.

72699993 is a deficient number, since it is larger than the sum of its proper divisors (32387275).

72699993 is a wasteful number, since it uses less digits than its factorization.

72699993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5864 (or 5861 counting only the distinct ones).

The product of its digits is 1653372, while the sum is 54.

The square root of 72699993 is about 8526.4290884285. The cubic root of 72699993 is about 417.3606079653.

The spelling of 72699993 in words is "seventy-two million, six hundred ninety-nine thousand, nine hundred ninety-three".