81219702 has 8 divisors (see below), whose sum is σ = 162439416. Its totient is φ = 27073232.

The previous prime is 81219701. The next prime is 81219703. The reversal of 81219702 is 20791218.

It is an interprime number because it is at equal distance from previous prime (81219701) and next prime (81219703).

It is a sphenic number, since it is the product of 3 distinct primes.

81219702 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 81219702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81219701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6768303 + ... + 6768314.

It is an arithmetic number, because the mean of its divisors is an integer number (20304927).

Almost surely, 2^81219702 is an apocalyptic number.

81219702 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81219702 is a wasteful number, since it uses less digits than its factorization.

81219702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13536622.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 81219702 is about 9012.1974013001. The cubic root of 81219702 is about 433.0657094389.

The spelling of 81219702 in words is "eighty-one million, two hundred nineteen thousand, seven hundred two".