7779880 has 48 divisors (see below), whose sum is σ = 18622620. Its totient is φ = 2924544.

The previous prime is 7779869. The next prime is 7779881. The reversal of 7779880 is 889777.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 4937284 + 2842596 = 2222^2 + 1686^2 .

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 7779880.

It is not an unprimeable number, because it can be changed into a prime (7779881) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11224 + ... + 11896.

Almost surely, 2^7779880 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 7779880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9311310).

7779880 is an abundant number, since it is smaller than the sum of its proper divisors (10842740).

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

7779880 is a wasteful number, since it uses less digits than its factorization.

7779880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718 (or 697 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 46.

The square root of 7779880 is about 2789.2436250711. The cubic root of 7779880 is about 198.1485807862.

The spelling of 7779880 in words is "seven million, seven hundred seventy-nine thousand, eight hundred eighty".