81943950 has 48 divisors (see below), whose sum is σ = 221700096. Its totient is φ = 19864800.

The previous prime is 81943933. The next prime is 81943957. The reversal of 81943950 is 5934918.

It is a junction number, because it is equal to n+sod(n) for n = 81943899 and 81943908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81943957) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23182 + ... + 26481.

It is an arithmetic number, because the mean of its divisors is an integer number (4618752).

Almost surely, 2^81943950 is an apocalyptic number.

81943950 is an abundant number, since it is smaller than the sum of its proper divisors (139756146).

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

81943950 is a wasteful number, since it uses less digits than its factorization.

81943950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49689 (or 49684 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 81943950 is about 9052.2897655787. The cubic root of 81943950 is about 434.3491389465.

The spelling of 81943950 in words is "eighty-one million, nine hundred forty-three thousand, nine hundred fifty".