81634754 has 16 divisors (see below), whose sum is σ = 129576480. Its totient is φ = 38465280.

The previous prime is 81634747. The next prime is 81634759. The reversal of 81634754 is 45743618.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (81634759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1769 + ... + 12899.

It is an arithmetic number, because the mean of its divisors is an integer number (8098530).

Almost surely, 2^81634754 is an apocalyptic number.

81634754 is a deficient number, since it is larger than the sum of its proper divisors (47941726).

81634754 is a wasteful number, since it uses less digits than its factorization.

81634754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11345.

The product of its digits is 80640, while the sum is 38.

The square root of 81634754 is about 9035.1952939602. The cubic root of 81634754 is about 433.8021460061.

The spelling of 81634754 in words is "eighty-one million, six hundred thirty-four thousand, seven hundred fifty-four".