81403896 has 48 divisors (see below), whose sum is σ = 236739240. Its totient is φ = 23257920.

The previous prime is 81403867. The next prime is 81403921. The reversal of 81403896 is 69830418.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33435 + ... + 35786.

Almost surely, 2^81403896 is an apocalyptic number.

It is an amenable number.

81403896 is an abundant number, since it is smaller than the sum of its proper divisors (155335344).

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

81403896 is a wasteful number, since it uses less digits than its factorization.

81403896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69244 (or 69233 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 81403896 is about 9022.4107643135. The cubic root of 81403896 is about 433.3928381138.

The spelling of 81403896 in words is "eighty-one million, four hundred three thousand, eight hundred ninety-six".