99720538 has 8 divisors (see below), whose sum is σ = 158379732. Its totient is φ = 46927296.

The previous prime is 99720529. The next prime is 99720541. The reversal of 99720538 is 83502799.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 96491329 + 3229209 = 9823^2 + 1797^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 99720494 and 99720503.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1466445 + ... + 1466512.

Almost surely, 2^99720538 is an apocalyptic number.

99720538 is a deficient number, since it is larger than the sum of its proper divisors (58659194).

99720538 is a wasteful number, since it uses less digits than its factorization.

99720538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2932976.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 99720538 is about 9986.0171239589. The cubic root of 99720538 is about 463.7260973869.

The spelling of 99720538 in words is "ninety-nine million, seven hundred twenty thousand, five hundred thirty-eight".