81210548 has 24 divisors (see below), whose sum is σ = 145805184. Its totient is φ = 39560000.

The previous prime is 81210511. The next prime is 81210587. The reversal of 81210548 is 84501218.

It is a self number, because there is not a number n which added to its sum of digits gives 81210548.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46328 + ... + 48048.

It is an arithmetic number, because the mean of its divisors is an integer number (6075216).

Almost surely, 2^81210548 is an apocalyptic number.

It is an amenable number.

81210548 is a deficient number, since it is larger than the sum of its proper divisors (64594636).

81210548 is a wasteful number, since it uses less digits than its factorization.

81210548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2023 (or 2021 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 81210548 is about 9011.6895197294. The cubic root of 81210548 is about 433.0494390335.

The spelling of 81210548 in words is "eighty-one million, two hundred ten thousand, five hundred forty-eight".