7878280 has 32 divisors (see below), whose sum is σ = 17933400. Its totient is φ = 3114496.

The previous prime is 7878271. The next prime is 7878289. The reversal of 7878280 is 828787.

It is an interprime number because it is at equal distance from previous prime (7878271) and next prime (7878289).

It can be written as a sum of positive squares in 4 ways, for example, as 7279204 + 599076 = 2698^2 + 774^2 .

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

It is not an unprimeable number, because it can be changed into a prime (7878289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2454 + ... + 4666.

Almost surely, 2^7878280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7878280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8966700).

7878280 is an abundant number, since it is smaller than the sum of its proper divisors (10055120).

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

7878280 is a wasteful number, since it uses less digits than its factorization.

7878280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2313 (or 2309 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 40.

The square root of 7878280 is about 2806.8273904891. The cubic root of 7878280 is about 198.9804783759.

The spelling of 7878280 in words is "seven million, eight hundred seventy-eight thousand, two hundred eighty".