99721677 has 32 divisors (see below), whose sum is σ = 154742400. Its totient is φ = 56453120.

The previous prime is 99721669. The next prime is 99721679. The reversal of 99721677 is 77612799.

It is not a de Polignac number, because 99721677 - 2³ = 99721669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99721679) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82993 + ... + 84185.

It is an arithmetic number, because the mean of its divisors is an integer number (4835700).

Almost surely, 2^99721677 is an apocalyptic number.

It is an amenable number.

99721677 is a deficient number, since it is larger than the sum of its proper divisors (55020723).

99721677 is a wasteful number, since it uses less digits than its factorization.

99721677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1373.

The product of its digits is 333396, while the sum is 48.

The square root of 99721677 is about 9986.0741535400. The cubic root of 99721677 is about 463.7278629276.

The spelling of 99721677 in words is "ninety-nine million, seven hundred twenty-one thousand, six hundred seventy-seven".