91229773828 has 48 divisors (see below), whose sum is σ = 169832557440. Its totient is φ = 42731582976.

The previous prime is 91229773823. The next prime is 91229773829. The reversal of 91229773828 is 82837792219.

It is not an unprimeable number, because it can be changed into a prime (91229773823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23712601 + ... + 23716447.

It is an arithmetic number, because the mean of its divisors is an integer number (3538178280).

Almost surely, 2^91229773828 is an apocalyptic number.

It is an amenable number.

91229773828 is a deficient number, since it is larger than the sum of its proper divisors (78602783612).

91229773828 is a wasteful number, since it uses less digits than its factorization.

91229773828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5404 (or 5402 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 58.

The spelling of 91229773828 in words is "ninety-one billion, two hundred twenty-nine million, seven hundred seventy-three thousand, eight hundred twenty-eight".