81025798762840 has 64 divisors (see below), whose sum is σ = 193283806464000. Its totient is φ = 30483617397120.

The previous prime is 81025798762819. The next prime is 81025798762873. The reversal of 81025798762840 is 4826789752018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 383393976 + ... + 383605255.

It is an arithmetic number, because the mean of its divisors is an integer number (3020059476000).

Almost surely, 2^{81025798762840} is an apocalyptic number.

It is an amenable number.

81025798762840 is an abundant number, since it is smaller than the sum of its proper divisors (112258007701160).

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

81025798762840 is a wasteful number, since it uses less digits than its factorization.

81025798762840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766999400 (or 766999396 counting only the distinct ones).

The product of its (nonzero) digits is 108380160, while the sum is 67.

The spelling of 81025798762840 in words is "eighty-one trillion, twenty-five billion, seven hundred ninety-eight million, seven hundred sixty-two thousand, eight hundred forty".