81214298780 has 48 divisors (see below), whose sum is σ = 173864789280. Its totient is φ = 31855020288.

The previous prime is 81214298777. The next prime is 81214298807. The reversal of 81214298780 is 8789241218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1969211 + ... + 2010029.

It is an arithmetic number, because the mean of its divisors is an integer number (3622183110).

Almost surely, 2^81214298780 is an apocalyptic number.

It is an amenable number.

81214298780 is an abundant number, since it is smaller than the sum of its proper divisors (92650490500).

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

81214298780 is a wasteful number, since it uses less digits than its factorization.

81214298780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42758 (or 42756 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 50.

The spelling of 81214298780 in words is "eighty-one billion, two hundred fourteen million, two hundred ninety-eight thousand, seven hundred eighty".