81068624 has 60 divisors (see below), whose sum is σ = 194425056. Its totient is φ = 32063616.

The previous prime is 81068621. The next prime is 81068639. The reversal of 81068624 is 42686018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81068621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16787 + ... + 21069.

Almost surely, 2^81068624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81068624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97212528).

81068624 is an abundant number, since it is smaller than the sum of its proper divisors (113356432).

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

81068624 is a wasteful number, since it uses less digits than its factorization.

81068624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4324 (or 4305 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 81068624 is about 9003.8116373012. The cubic root of 81068624 is about 432.7970254100.

The spelling of 81068624 in words is "eighty-one million, sixty-eight thousand, six hundred twenty-four".