81367758 has 12 divisors (see below), whose sum is σ = 176296848. Its totient is φ = 27122580.

The previous prime is 81367753. The next prime is 81367799. The reversal of 81367758 is 85776318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81367751) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2260198 + ... + 2260233.

It is an arithmetic number, because the mean of its divisors is an integer number (14691404).

Almost surely, 2^81367758 is an apocalyptic number.

81367758 is an abundant number, since it is smaller than the sum of its proper divisors (94929090).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81367758 is a wasteful number, since it uses less digits than its factorization.

81367758 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4520439 (or 4520436 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 81367758 is about 9020.4078621756. The cubic root of 81367758 is about 433.3286959399.

The spelling of 81367758 in words is "eighty-one million, three hundred sixty-seven thousand, seven hundred fifty-eight".