81948748140 has 120 divisors (see below), whose sum is σ = 293801478432. Its totient is φ = 18731139840.

The previous prime is 81948748111. The next prime is 81948748151. The reversal of 81948748140 is 4184784918.

81948748140 is a `hidden beast` number, since 8 + 19 + 487 + 4 + 8 + 140 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3601921 + ... + 3624600.

Almost surely, 2^81948748140 is an apocalyptic number.

It is an amenable number.

81948748140 is an abundant number, since it is smaller than the sum of its proper divisors (211852730292).

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

81948748140 is a wasteful number, since it uses less digits than its factorization.

81948748140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7226549 (or 7226538 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 54.

The spelling of 81948748140 in words is "eighty-one billion, nine hundred forty-eight million, seven hundred forty-eight thousand, one hundred forty".