81057396 has 24 divisors (see below), whose sum is σ = 216153280. Its totient is φ = 23159232.

The previous prime is 81057391. The next prime is 81057409. The reversal of 81057396 is 69375018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81057391) 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, 482401 + ... + 482568.

Almost surely, 2^81057396 is an apocalyptic number.

It is an amenable number.

81057396 is an abundant number, since it is smaller than the sum of its proper divisors (135095884).

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

81057396 is a wasteful number, since it uses less digits than its factorization.

81057396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964983 (or 964981 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 81057396 is about 9003.1881020003. The cubic root of 81057396 is about 432.7770436993. Note that the first 3 decimals are identical.

The spelling of 81057396 in words is "eighty-one million, fifty-seven thousand, three hundred ninety-six".