81753693 has 16 divisors (see below), whose sum is σ = 124709376. Its totient is φ = 46666800.

The previous prime is 81753691. The next prime is 81753701. The reversal of 81753693 is 39635718.

It is not a de Polignac number, because 81753693 - 2¹ = 81753691 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81753691) 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, 29130 + ... + 31812.

It is an arithmetic number, because the mean of its divisors is an integer number (7794336).

Almost surely, 2^81753693 is an apocalyptic number.

It is an amenable number.

81753693 is a deficient number, since it is larger than the sum of its proper divisors (42955683).

81753693 is a wasteful number, since it uses less digits than its factorization.

81753693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4144.

The product of its digits is 136080, while the sum is 42.

The square root of 81753693 is about 9041.7748810729. The cubic root of 81753693 is about 434.0127219897.

The spelling of 81753693 in words is "eighty-one million, seven hundred fifty-three thousand, six hundred ninety-three".