81877394748 has 48 divisors (see below), whose sum is σ = 195774717600. Its totient is φ = 26617574400.

The previous prime is 81877394747. The next prime is 81877394759. The reversal of 81877394748 is 84749377818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81877394747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1472818 + ... + 1527398.

It is an arithmetic number, because the mean of its divisors is an integer number (4078639950).

Almost surely, 2^81877394748 is an apocalyptic number.

It is an amenable number.

81877394748 is an abundant number, since it is smaller than the sum of its proper divisors (113897322852).

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

81877394748 is a wasteful number, since it uses less digits than its factorization.

81877394748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57678 (or 57676 counting only the distinct ones).

The product of its digits is 75866112, while the sum is 66.

The spelling of 81877394748 in words is "eighty-one billion, eight hundred seventy-seven million, three hundred ninety-four thousand, seven hundred forty-eight".