99796781 has 12 divisors (see below), whose sum is σ = 119836800. Its totient is φ = 82779480.

The previous prime is 99796771. The next prime is 99796799. The reversal of 99796781 is 18769799.

It is not a de Polignac number, because 99796781 - 2²² = 95602477 is a prime.

It is a super-2 number, since 2×99796781² = 19918794995923922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99796771) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31331 + ... + 34368.

It is an arithmetic number, because the mean of its divisors is an integer number (9986400).

Almost surely, 2^99796781 is an apocalyptic number.

It is an amenable number.

99796781 is a deficient number, since it is larger than the sum of its proper divisors (20040019).

99796781 is a wasteful number, since it uses less digits than its factorization.

99796781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65744 (or 65737 counting only the distinct ones).

The product of its digits is 1714608, while the sum is 56.

The square root of 99796781 is about 9989.8338825028. The cubic root of 99796781 is about 463.8442504533.

The spelling of 99796781 in words is "ninety-nine million, seven hundred ninety-six thousand, seven hundred eighty-one".