7778790 has 48 divisors (see below), whose sum is σ = 21294000. Its totient is φ = 1964736.

The previous prime is 7778783. The next prime is 7778791. The reversal of 7778790 is 978777.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7778791) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 565 + ... + 3984.

It is an arithmetic number, because the mean of its divisors is an integer number (443625).

Almost surely, 2^7778790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7778790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10647000).

7778790 is an abundant number, since it is smaller than the sum of its proper divisors (13515210).

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

7778790 is a wasteful number, since it uses less digits than its factorization.

7778790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4581 (or 4578 counting only the distinct ones).

The product of its (nonzero) digits is 172872, while the sum is 45.

The square root of 7778790 is about 2789.0482247534. The cubic root of 7778790 is about 198.1393264858.

It can be divided in two parts, 77787 and 90, that added together give a palindrome (77877).

The spelling of 7778790 in words is "seven million, seven hundred seventy-eight thousand, seven hundred ninety".