8427780 has 48 divisors (see below), whose sum is σ = 26221440. Its totient is φ = 2247264.

The previous prime is 8427779. The next prime is 8427781. The reversal of 8427780 is 877248.

It is an interprime number because it is at equal distance from previous prime (8427779) and next prime (8427781).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (8427781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7264 + ... + 8343.

It is an arithmetic number, because the mean of its divisors is an integer number (546280).

Almost surely, 2^8427780 is an apocalyptic number.

It is an amenable number.

8427780 is an abundant number, since it is smaller than the sum of its proper divisors (17793660).

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

8427780 is a wasteful number, since it uses less digits than its factorization.

8427780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15625 (or 15617 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 8427780 is about 2903.0638987112. The cubic root of 8427780 is about 203.5031159787.

The spelling of 8427780 in words is "eight million, four hundred twenty-seven thousand, seven hundred eighty".