7978798 has 8 divisors (see below), whose sum is σ = 12087000. Its totient is φ = 3949800.

The previous prime is 7978793. The next prime is 7978807. The reversal of 7978798 is 8978797.

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

It is a super-2 number, since 2×7978798² = 127322435049608, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7978793) 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, 19548 + ... + 19951.

It is an arithmetic number, because the mean of its divisors is an integer number (1510875).

Almost surely, 2^7978798 is an apocalyptic number.

7978798 is a deficient number, since it is larger than the sum of its proper divisors (4108202).

7978798 is a wasteful number, since it uses less digits than its factorization.

7978798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39602.

The product of its digits is 1778112, while the sum is 55.

The square root of 7978798 is about 2824.6766186592. The cubic root of 7978798 is about 199.8231603514.

Subtracting 7978798 from its reverse (8978797), we obtain a palindrome (999999).

It can be divided in two parts, 7 and 978798, that multiplied together give a palindrome (6851586).

The spelling of 7978798 in words is "seven million, nine hundred seventy-eight thousand, seven hundred ninety-eight".