7780998 has 8 divisors (see below), whose sum is σ = 15562008. Its totient is φ = 2593664.

The previous prime is 7780963. The next prime is 7780999. The reversal of 7780998 is 8990877.

7780998 is nontrivially palindromic in base 5.

It is a sphenic number, since it is the product of 3 distinct primes.

7780998 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7780999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 648411 + ... + 648422.

It is an arithmetic number, because the mean of its divisors is an integer number (1945251).

Almost surely, 2^7780998 is an apocalyptic number.

7780998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

7780998 is a wasteful number, since it uses less digits than its factorization.

7780998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296838.

The product of its (nonzero) digits is 254016, while the sum is 48.

The square root of 7780998 is about 2789.4440306269. Note that the first 3 decimals coincide. The cubic root of 7780998 is about 198.1580719139.

It can be divided in two parts, 7780 and 998, that added together give a palindrome (8778).

The spelling of 7780998 in words is "seven million, seven hundred eighty thousand, nine hundred ninety-eight".