99720929 has 24 divisors (see below), whose sum is σ = 134003808. Its totient is φ = 73127040.

The previous prime is 99720923. The next prime is 99720961. The reversal of 99720929 is 92902799.

99720929 = 132² + 133² + ... + 670².

It is not a de Polignac number, because 99720929 - 2¹² = 99716833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99720923) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3722 + ... + 14604.

It is an arithmetic number, because the mean of its divisors is an integer number (5583492).

Almost surely, 2^99720929 is an apocalyptic number.

It is an amenable number.

99720929 is a deficient number, since it is larger than the sum of its proper divisors (34282879).

99720929 is a wasteful number, since it uses less digits than its factorization.

99720929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10925 (or 10918 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 47.

The square root of 99720929 is about 9986.0367013145. The cubic root of 99720929 is about 463.7267034696.

The spelling of 99720929 in words is "ninety-nine million, seven hundred twenty thousand, nine hundred twenty-nine".