81069772 has 12 divisors (see below), whose sum is σ = 162139600. Its totient is φ = 34744176.

The previous prime is 81069767. The next prime is 81069773. The reversal of 81069772 is 27796018.

81069772 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (81069773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1447647 + ... + 1447702.

Almost surely, 2^81069772 is an apocalyptic number.

It is an amenable number.

81069772 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81069772 is a wasteful number, since it uses less digits than its factorization.

81069772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2895360 (or 2895358 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 81069772 is about 9003.8753878538. The cubic root of 81069772 is about 432.7990683238.

The spelling of 81069772 in words is "eighty-one million, sixty-nine thousand, seven hundred seventy-two".