81214812 has 60 divisors (see below), whose sum is σ = 242648560. Its totient is φ = 23203584.

The previous prime is 81214811. The next prime is 81214813. The reversal of 81214812 is 21841218.

It is an interprime number because it is at equal distance from previous prime (81214811) and next prime (81214813).

It is a super-4 number, since 4×81214812⁴ (a number of 33 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81214811) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15637 + ... + 20172.

Almost surely, 2^81214812 is an apocalyptic number.

It is an amenable number.

81214812 is an abundant number, since it is smaller than the sum of its proper divisors (161433748).

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

81214812 is a wasteful number, since it uses less digits than its factorization.

81214812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35832 (or 35821 counting only the distinct ones).

The product of its digits is 1024, while the sum is 27.

The square root of 81214812 is about 9011.9260982323. The cubic root of 81214812 is about 433.0570180592.

The spelling of 81214812 in words is "eighty-one million, two hundred fourteen thousand, eight hundred twelve".