81370412 has 48 divisors (see below), whose sum is σ = 155430912. Its totient is φ = 37160640.

The previous prime is 81370403. The next prime is 81370441. The reversal of 81370412 is 21407318.

It is a super-3 number, since 3×81370412³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 293618 + ... + 293894.

It is an arithmetic number, because the mean of its divisors is an integer number (3238144).

Almost surely, 2^81370412 is an apocalyptic number.

It is an amenable number.

81370412 is a deficient number, since it is larger than the sum of its proper divisors (74060500).

81370412 is a wasteful number, since it uses less digits than its factorization.

81370412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438 (or 436 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 81370412 is about 9020.5549718407. The cubic root of 81370412 is about 433.3334072321. Note that the first 3 decimals are identical.

The spelling of 81370412 in words is "eighty-one million, three hundred seventy thousand, four hundred twelve".