8642780 has 12 divisors (see below), whose sum is σ = 18149880. Its totient is φ = 3457104.

The previous prime is 8642773. The next prime is 8642819. The reversal of 8642780 is 872468.

It is a super-2 number, since 2×8642780² = 149395292256800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8642780.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 216050 + ... + 216089.

It is an arithmetic number, because the mean of its divisors is an integer number (1512490).

Almost surely, 2^8642780 is an apocalyptic number.

It is an amenable number.

8642780 is an abundant number, since it is smaller than the sum of its proper divisors (9507100).

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

8642780 is a wasteful number, since it uses less digits than its factorization.

8642780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432148 (or 432146 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 8642780 is about 2939.8605409101. The cubic root of 8642780 is about 205.2191192650.

The spelling of 8642780 in words is "eight million, six hundred forty-two thousand, seven hundred eighty".