7788642 has 16 divisors (see below), whose sum is σ = 15640992. Its totient is φ = 2585600.

The previous prime is 7788631. The next prime is 7788653. The reversal of 7788642 is 2468877.

It is an interprime number because it is at equal distance from previous prime (7788631) and next prime (7788653).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 7788594 and 7788603.

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, 984 + ... + 4067.

It is an arithmetic number, because the mean of its divisors is an integer number (977562).

Almost surely, 2^7788642 is an apocalyptic number.

7788642 is an abundant number, since it is smaller than the sum of its proper divisors (7852350).

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

7788642 is a wasteful number, since it uses less digits than its factorization.

7788642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5313.

The product of its digits is 150528, while the sum is 42.

The square root of 7788642 is about 2790.8138597907. The cubic root of 7788642 is about 198.2229403945. Note that the first 3 decimals are identical.

The spelling of 7788642 in words is "seven million, seven hundred eighty-eight thousand, six hundred forty-two".