7778242 has 16 divisors (see below), whose sum is σ = 11907072. Its totient is φ = 3810240.

The previous prime is 7778237. The next prime is 7778269. The reversal of 7778242 is 2428777.

It is a super-2 number, since 2×7778242² = 121002097221128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28567 + ... + 28837.

It is an arithmetic number, because the mean of its divisors is an integer number (744192).

Almost surely, 2^7778242 is an apocalyptic number.

7778242 is a deficient number, since it is larger than the sum of its proper divisors (4128830).

7778242 is a wasteful number, since it uses less digits than its factorization.

7778242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513.

The product of its digits is 43904, while the sum is 37.

The square root of 7778242 is about 2788.9499816239. The cubic root of 7778242 is about 198.1346735384.

The spelling of 7778242 in words is "seven million, seven hundred seventy-eight thousand, two hundred forty-two".