99620557 has 4 divisors (see below), whose sum is σ = 99980476. Its totient is φ = 99260640.

The previous prime is 99620537. The next prime is 99620569. The reversal of 99620557 is 75502699.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17065161 + 82555396 = 4131^2 + 9086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99620557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99620537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179544 + ... + 180097.

It is an arithmetic number, because the mean of its divisors is an integer number (24995119).

Almost surely, 2^99620557 is an apocalyptic number.

It is an amenable number.

99620557 is a deficient number, since it is larger than the sum of its proper divisors (359919).

99620557 is a wasteful number, since it uses less digits than its factorization.

99620557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359918.

The product of its (nonzero) digits is 170100, while the sum is 43.

The square root of 99620557 is about 9981.0098186506. The cubic root of 99620557 is about 463.5710664592.

The spelling of 99620557 in words is "ninety-nine million, six hundred twenty thousand, five hundred fifty-seven".