81914812 has 24 divisors (see below), whose sum is σ = 164242400. Its totient is φ = 35017920.

The previous prime is 81914779. The next prime is 81914831. The reversal of 81914812 is 21841918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8314 + ... + 15262.

Almost surely, 2^81914812 is an apocalyptic number.

It is an amenable number.

81914812 is an abundant number, since it is smaller than the sum of its proper divisors (82327588).

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

81914812 is a wasteful number, since it uses less digits than its factorization.

81914812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7381 (or 7379 counting only the distinct ones).

The product of its digits is 4608, while the sum is 34.

The square root of 81914812 is about 9050.6801954328. The cubic root of 81914812 is about 434.2976502334.

The spelling of 81914812 in words is "eighty-one million, nine hundred fourteen thousand, eight hundred twelve".