81210983028 has 24 divisors (see below), whose sum is σ = 216562621632. Its totient is φ = 23203137984.

The previous prime is 81210983023. The next prime is 81210983071. The reversal of 81210983028 is 82038901218.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81210983023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 483398625 + ... + 483398792.

It is an arithmetic number, because the mean of its divisors is an integer number (9023442568).

Almost surely, 2^81210983028 is an apocalyptic number.

It is an amenable number.

81210983028 is an abundant number, since it is smaller than the sum of its proper divisors (135351638604).

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

81210983028 is a wasteful number, since it uses less digits than its factorization.

81210983028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966797431 (or 966797429 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 42.

The spelling of 81210983028 in words is "eighty-one billion, two hundred ten million, nine hundred eighty-three thousand, twenty-eight".