81675100 has 36 divisors (see below), whose sum is σ = 190871464. Its totient is φ = 30156480.

The previous prime is 81675079. The next prime is 81675109. The reversal of 81675100 is 157618.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81675109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30114 + ... + 32713.

Almost surely, 2^81675100 is an apocalyptic number.

It is an amenable number.

81675100 is an abundant number, since it is smaller than the sum of its proper divisors (109196364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81675100 is a wasteful number, since it uses less digits than its factorization.

81675100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62854 (or 62847 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 81675100 is about 9037.4277313846. The cubic root of 81675100 is about 433.8735996374.

The spelling of 81675100 in words is "eighty-one million, six hundred seventy-five thousand, one hundred".