81725410 has 32 divisors (see below), whose sum is σ = 160079472. Its totient is φ = 29859840.

The previous prime is 81725387. The next prime is 81725411. The reversal of 81725410 is 1452718.

It can be written as a sum of positive squares in 8 ways, for example, as 39955041 + 41770369 = 6321^2 + 6463^2 .

It is not an unprimeable number, because it can be changed into a prime (81725411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9370 + ... + 15850.

Almost surely, 2^81725410 is an apocalyptic number.

81725410 is a deficient number, since it is larger than the sum of its proper divisors (78354062).

81725410 is a wasteful number, since it uses less digits than its factorization.

81725410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6598.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 81725410 is about 9040.2107276324. The cubic root of 81725410 is about 433.9626667682.

The spelling of 81725410 in words is "eighty-one million, seven hundred twenty-five thousand, four hundred ten".