81370712 has 16 divisors (see below), whose sum is σ = 152665800. Its totient is φ = 40659840.

The previous prime is 81370699. The next prime is 81370717. The reversal of 81370712 is 21707318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81370717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23339 + ... + 26597.

Almost surely, 2^81370712 is an apocalyptic number.

It is an amenable number.

81370712 is a deficient number, since it is larger than the sum of its proper divisors (71295088).

81370712 is a wasteful number, since it uses less digits than its factorization.

81370712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6386 (or 6382 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 81370712 is about 9020.5716005140. The cubic root of 81370712 is about 433.3339397756. Note that the first 3 decimals are identical.

The spelling of 81370712 in words is "eighty-one million, three hundred seventy thousand, seven hundred twelve".