7978794253 has 4 divisors (see below), whose sum is σ = 7979123520. Its totient is φ = 7978464988.

The previous prime is 7978794209. The next prime is 7978794269. The reversal of 7978794253 is 3524978797.

7978794253 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7978794253 - 2⁹ = 7978793741 is a prime.

It is a super-2 number, since 2×7978794253² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7978794191 and 7978794200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7978794283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125125 + ... + 177802.

It is an arithmetic number, because the mean of its divisors is an integer number (1994780880).

Almost surely, 2^7978794253 is an apocalyptic number.

It is an amenable number.

7978794253 is a deficient number, since it is larger than the sum of its proper divisors (329267).

7978794253 is a wasteful number, since it uses less digits than its factorization.

7978794253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329266.

The product of its digits is 26671680, while the sum is 61.

The square root of 7978794253 is about 89324.0967096785. The cubic root of 7978794253 is about 1998.2312907115.

The spelling of 7978794253 in words is "seven billion, nine hundred seventy-eight million, seven hundred ninety-four thousand, two hundred fifty-three".