81367847750 has 64 divisors (see below), whose sum is σ = 175149292032. Its totient is φ = 27726300000.

The previous prime is 81367847731. The next prime is 81367847801. The reversal of 81367847750 is 5774876318.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 142625 + ... + 427875.

It is an arithmetic number, because the mean of its divisors is an integer number (2736707688).

Almost surely, 2^81367847750 is an apocalyptic number.

It is a pronic number, being equal to 285250×285251.

81367847750 is an abundant number, since it is smaller than the sum of its proper divisors (93781444282).

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

81367847750 is a wasteful number, since it uses less digits than its factorization.

81367847750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285438 (or 285428 counting only the distinct ones).

The product of its (nonzero) digits is 7902720, while the sum is 56.

The spelling of 81367847750 in words is "eighty-one billion, three hundred sixty-seven million, eight hundred forty-seven thousand, seven hundred fifty".