81985350 has 24 divisors (see below), whose sum is σ = 203324040. Its totient is φ = 21862720.

The previous prime is 81985327. The next prime is 81985367. The reversal of 81985350 is 5358918.

It is a super-2 number, since 2×81985350² = 13443195229245000, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81985299 and 81985308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 273135 + ... + 273434.

It is an arithmetic number, because the mean of its divisors is an integer number (8471835).

Almost surely, 2^81985350 is an apocalyptic number.

81985350 is an abundant number, since it is smaller than the sum of its proper divisors (121338690).

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

81985350 is a wasteful number, since it uses less digits than its factorization.

81985350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546584 (or 546579 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 81985350 is about 9054.5761910760. The cubic root of 81985350 is about 434.4222744124.

The spelling of 81985350 in words is "eighty-one million, nine hundred eighty-five thousand, three hundred fifty".