81429684 has 48 divisors (see below), whose sum is σ = 224157696. Its totient is φ = 22514400.

The previous prime is 81429613. The next prime is 81429707. The reversal of 81429684 is 48692418.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13032 + ... + 18239.

It is an arithmetic number, because the mean of its divisors is an integer number (4669952).

Almost surely, 2^81429684 is an apocalyptic number.

81429684 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

81429684 is an abundant number, since it is smaller than the sum of its proper divisors (142728012).

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

81429684 is a wasteful number, since it uses less digits than its factorization.

81429684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31316 (or 31314 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 81429684 is about 9023.8397592156. The cubic root of 81429684 is about 433.4385982272.

The spelling of 81429684 in words is "eighty-one million, four hundred twenty-nine thousand, six hundred eighty-four".