99671956 has 18 divisors (see below), whose sum is σ = 180654110. Its totient is φ = 48115872.

The previous prime is 99671939. The next prime is 99671977. The reversal of 99671956 is 65917699.

It can be written as a sum of positive squares in 3 ways, for example, as 36723600 + 62948356 = 6060^2 + 7934^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11451 + ... + 18178.

Almost surely, 2^99671956 is an apocalyptic number.

It is an amenable number.

99671956 is a deficient number, since it is larger than the sum of its proper divisors (80982154).

99671956 is a wasteful number, since it uses less digits than its factorization.

99671956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29691 (or 29660 counting only the distinct ones).

The product of its digits is 918540, while the sum is 52.

The square root of 99671956 is about 9983.5843262828. The cubic root of 99671956 is about 463.6507788977.

The spelling of 99671956 in words is "ninety-nine million, six hundred seventy-one thousand, nine hundred fifty-six".