81300008782 has 8 divisors (see below), whose sum is σ = 123157439352. Its totient is φ = 40247529000.

The previous prime is 81300008771. The next prime is 81300008833. The reversal of 81300008782 is 28780000318.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201237444 + ... + 201237847.

It is an arithmetic number, because the mean of its divisors is an integer number (15394679919).

Almost surely, 2^81300008782 is an apocalyptic number.

81300008782 is a deficient number, since it is larger than the sum of its proper divisors (41857430570).

81300008782 is a wasteful number, since it uses less digits than its factorization.

81300008782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402475394.

The product of its (nonzero) digits is 21504, while the sum is 37.

The spelling of 81300008782 in words is "eighty-one billion, three hundred million, eight thousand, seven hundred eighty-two".