81578893330 has 32 divisors (see below), whose sum is σ = 161515202688. Its totient is φ = 29665047280.

The previous prime is 81578893267. The next prime is 81578893349. The reversal of 81578893330 is 3339887518.

It is a Harshad number since it is a multiple of its sum of digits (55).

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, 3051262 + ... + 3077881.

It is an arithmetic number, because the mean of its divisors is an integer number (5047350084).

Almost surely, 2^81578893330 is an apocalyptic number.

81578893330 is a deficient number, since it is larger than the sum of its proper divisors (79936309358).

81578893330 is a wasteful number, since it uses less digits than its factorization.

81578893330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6129183 (or 6129161 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 55.

The spelling of 81578893330 in words is "eighty-one billion, five hundred seventy-eight million, eight hundred ninety-three thousand, three hundred thirty".