7778042 has 8 divisors (see below), whose sum is σ = 11787636. Its totient is φ = 3848832.

The previous prime is 7778041. The next prime is 7778051. The reversal of 7778042 is 2408777.

It can be written as a sum of positive squares in 2 ways, for example, as 7123561 + 654481 = 2669^2 + 809^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 7777993 and 7778011.

It is not an unprimeable number, because it can be changed into a prime (7778041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19853 + ... + 20240.

Almost surely, 2^7778042 is an apocalyptic number.

7778042 is a deficient number, since it is larger than the sum of its proper divisors (4009594).

7778042 is a wasteful number, since it uses less digits than its factorization.

7778042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40192.

The product of its (nonzero) digits is 21952, while the sum is 35.

The square root of 7778042 is about 2788.9141256052. The cubic root of 7778042 is about 198.1329753280.

The spelling of 7778042 in words is "seven million, seven hundred seventy-eight thousand, forty-two".