8778640 has 80 divisors (see below), whose sum is σ = 22998528. Its totient is φ = 3091968.

The previous prime is 8778629. The next prime is 8778641. The reversal of 8778640 is 468778.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 8778593 and 8778602.

It is not an unprimeable number, because it can be changed into a prime (8778641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23737 + ... + 24103.

Almost surely, 2^8778640 is an apocalyptic number.

8778640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8778640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11499264).

8778640 is an abundant number, since it is smaller than the sum of its proper divisors (14219888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8778640 is a wasteful number, since it uses less digits than its factorization.

8778640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416 (or 410 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 8778640 is about 2962.8769802339. The cubic root of 8778640 is about 206.2888460654.

The spelling of 8778640 in words is "eight million, seven hundred seventy-eight thousand, six hundred forty".