8778491 has 4 divisors (see below), whose sum is σ = 8787432. Its totient is φ = 8769552.

The previous prime is 8778467. The next prime is 8778499. The reversal of 8778491 is 1948778.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8778491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8778499) 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, 2786 + ... + 5031.

It is an arithmetic number, because the mean of its divisors is an integer number (2196858).

Almost surely, 2^8778491 is an apocalyptic number.

8778491 is a deficient number, since it is larger than the sum of its proper divisors (8941).

8778491 is a wasteful number, since it uses less digits than its factorization.

8778491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8940.

The product of its digits is 112896, while the sum is 44.

The square root of 8778491 is about 2962.8518356475. The cubic root of 8778491 is about 206.2876789441.

The spelling of 8778491 in words is "eight million, seven hundred seventy-eight thousand, four hundred ninety-one".