81070788 has 24 divisors (see below), whose sum is σ = 189326592. Its totient is φ = 27000544.

The previous prime is 81070783. The next prime is 81070799. The reversal of 81070788 is 88707018.

It is a happy number.

It is a super-4 number, since 4×81070788⁴ (a number of 33 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (81070783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17581 + ... + 21707.

It is an arithmetic number, because the mean of its divisors is an integer number (7888608).

Almost surely, 2^81070788 is an apocalyptic number.

It is an amenable number.

81070788 is an abundant number, since it is smaller than the sum of its proper divisors (108255804).

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

81070788 is a wasteful number, since it uses less digits than its factorization.

81070788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5771 (or 5769 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 39.

The square root of 81070788 is about 9003.9318078271. The cubic root of 81070788 is about 432.8008763221.

The spelling of 81070788 in words is "eighty-one million, seventy thousand, seven hundred eighty-eight".