81354210428 has 72 divisors (see below), whose sum is σ = 149909659200. Its totient is φ = 38619389952.

The previous prime is 81354210407. The next prime is 81354210437. The reversal of 81354210428 is 82401245318.

It is a junction number, because it is equal to n+sod(n) for n = 81354210391 and 81354210400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38500700 + ... + 38502812.

It is an arithmetic number, because the mean of its divisors is an integer number (2082078600).

Almost surely, 2^81354210428 is an apocalyptic number.

It is an amenable number.

81354210428 is a deficient number, since it is larger than the sum of its proper divisors (68555448772).

81354210428 is a wasteful number, since it uses less digits than its factorization.

81354210428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2359 (or 2320 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 38.

The spelling of 81354210428 in words is "eighty-one billion, three hundred fifty-four million, two hundred ten thousand, four hundred twenty-eight".