81469572 has 24 divisors (see below), whose sum is σ = 190401792. Its totient is φ = 27112800.

The previous prime is 81469571. The next prime is 81469573. The reversal of 81469572 is 27596418.

It is an interprime number because it is at equal distance from previous prime (81469571) and next prime (81469573).

It is not an unprimeable number, because it can be changed into a prime (81469571) 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, 2797 + ... + 13067.

It is an arithmetic number, because the mean of its divisors is an integer number (7933408).

Almost surely, 2^81469572 is an apocalyptic number.

It is an amenable number.

81469572 is an abundant number, since it is smaller than the sum of its proper divisors (108932220).

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

81469572 is a wasteful number, since it uses less digits than its factorization.

81469572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10939 (or 10937 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The square root of 81469572 is about 9026.0496342531. The cubic root of 81469572 is about 433.5093593868.

The spelling of 81469572 in words is "eighty-one million, four hundred sixty-nine thousand, five hundred seventy-two".