81228059374 has 32 divisors (see below), whose sum is σ = 152471808000. Its totient is φ = 31529631840.

The previous prime is 81228059369. The next prime is 81228059449. The reversal of 81228059374 is 47395082218.

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, 938974 + ... + 1021825.

It is an arithmetic number, because the mean of its divisors is an integer number (4764744000).

Almost surely, 2^81228059374 is an apocalyptic number.

81228059374 is a deficient number, since it is larger than the sum of its proper divisors (71243748626).

81228059374 is a wasteful number, since it uses less digits than its factorization.

81228059374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1961088.

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 81228059374 in words is "eighty-one billion, two hundred twenty-eight million, fifty-nine thousand, three hundred seventy-four".