81469916 has 24 divisors (see below), whose sum is σ = 164684016. Its totient is φ = 34853120.

The previous prime is 81469909. The next prime is 81469919. The reversal of 81469916 is 61996418.

It is a super-3 number, since 3×81469916³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81469919) 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, 53711 + ... + 55206.

It is an arithmetic number, because the mean of its divisors is an integer number (6861834).

Almost surely, 2^81469916 is an apocalyptic number.

It is an amenable number.

81469916 is an abundant number, since it is smaller than the sum of its proper divisors (83214100).

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

81469916 is a wasteful number, since it uses less digits than its factorization.

81469916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108949 (or 108947 counting only the distinct ones).

The product of its digits is 93312, while the sum is 44.

The square root of 81469916 is about 9026.0686901884. The cubic root of 81469916 is about 433.5099695410.

The spelling of 81469916 in words is "eighty-one million, four hundred sixty-nine thousand, nine hundred sixteen".