81902954390 has 24 divisors (see below), whose sum is σ = 155592932400. Its totient is φ = 31036907664.

The previous prime is 81902954381. The next prime is 81902954411. The reversal of 81902954390 is 9345920918.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11340290 + ... + 11347509.

It is an arithmetic number, because the mean of its divisors is an integer number (6483038850).

Almost surely, 2^81902954390 is an apocalyptic number.

81902954390 is a deficient number, since it is larger than the sum of its proper divisors (73689978010).

81902954390 is a wasteful number, since it uses less digits than its factorization.

81902954390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22687844 (or 22687825 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 50.

The spelling of 81902954390 in words is "eighty-one billion, nine hundred two million, nine hundred fifty-four thousand, three hundred ninety".