81747010 has 8 divisors (see below), whose sum is σ = 147144636. Its totient is φ = 32698800.

The previous prime is 81746981. The next prime is 81747019. The reversal of 81747010 is 1074718.

It can be written as a sum of positive squares in 2 ways, for example, as 75290329 + 6456681 = 8677^2 + 2541^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 81747010.

It is not an unprimeable number, because it can be changed into a prime (81747019) 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, 4087341 + ... + 4087360.

Almost surely, 2^81747010 is an apocalyptic number.

81747010 is a deficient number, since it is larger than the sum of its proper divisors (65397626).

81747010 is a wasteful number, since it uses less digits than its factorization.

81747010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8174708.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 81747010 is about 9041.4053111228. The cubic root of 81747010 is about 434.0008954656. Note that the first 3 decimals are identical.

The spelling of 81747010 in words is "eighty-one million, seven hundred forty-seven thousand, ten".