81294739800 has 96 divisors (see below), whose sum is σ = 252168867600. Its totient is φ = 21665249280.

The previous prime is 81294739763. The next prime is 81294739817. The reversal of 81294739800 is 893749218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 953316 + ... + 1035084.

Almost surely, 2^81294739800 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81294739800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126084433800).

81294739800 is an abundant number, since it is smaller than the sum of its proper divisors (170874127800).

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

81294739800 is a wasteful number, since it uses less digits than its factorization.

81294739800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83445 (or 83436 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 51.

The spelling of 81294739800 in words is "eighty-one billion, two hundred ninety-four million, seven hundred thirty-nine thousand, eight hundred".