9078798821 has 4 divisors (see below), whose sum is σ = 9086011200. Its totient is φ = 9071586444.

The previous prime is 9078798791. The next prime is 9078798853. The reversal of 9078798821 is 1288978709.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9078798821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9078798871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3604301 + ... + 3606818.

It is an arithmetic number, because the mean of its divisors is an integer number (2271502800).

Almost surely, 2^9078798821 is an apocalyptic number.

It is an amenable number.

9078798821 is a deficient number, since it is larger than the sum of its proper divisors (7212379).

9078798821 is a wasteful number, since it uses less digits than its factorization.

9078798821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7212378.

The product of its (nonzero) digits is 4064256, while the sum is 59.

The square root of 9078798821 is about 95282.7309694679. The cubic root of 9078798821 is about 2086.1368639531.

The spelling of 9078798821 in words is "nine billion, seventy-eight million, seven hundred ninety-eight thousand, eight hundred twenty-one".