99720539 has 6 divisors (see below), whose sum is σ = 100129260. Its totient is φ = 99313256.

The previous prime is 99720529. The next prime is 99720541. The reversal of 99720539 is 93502799.

It is a de Polignac number, because none of the positive numbers 2^k-99720539 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 99720539.

It is not an unprimeable number, because it can be changed into a prime (99720529) 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 5 ways as a sum of consecutive naturals, for example, 150992 + ... + 151650.

It is an arithmetic number, because the mean of its divisors is an integer number (16688210).

Almost surely, 2^99720539 is an apocalyptic number.

99720539 is a deficient number, since it is larger than the sum of its proper divisors (408721).

99720539 is an frugal number, since it uses more digits than its factorization.

99720539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1437 (or 1048 counting only the distinct ones).

The product of its (nonzero) digits is 153090, while the sum is 44.

The square root of 99720539 is about 9986.0171740289. The cubic root of 99720539 is about 463.7260989370.

The spelling of 99720539 in words is "ninety-nine million, seven hundred twenty thousand, five hundred thirty-nine".