7428918191 has 4 divisors (see below), whose sum is σ = 7434682800. Its totient is φ = 7423153584.

The previous prime is 7428918137. The next prime is 7428918209. The reversal of 7428918191 is 1918198247.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7428918191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7428918121) 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, 2880371 + ... + 2882948.

It is an arithmetic number, because the mean of its divisors is an integer number (1858670700).

Almost surely, 2^7428918191 is an apocalyptic number.

7428918191 is a deficient number, since it is larger than the sum of its proper divisors (5764609).

7428918191 is a wasteful number, since it uses less digits than its factorization.

7428918191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5764608.

The product of its digits is 290304, while the sum is 50.

The square root of 7428918191 is about 86191.1723496090. The cubic root of 7428918191 is about 1951.2302726057.

The spelling of 7428918191 in words is "seven billion, four hundred twenty-eight million, nine hundred eighteen thousand, one hundred ninety-one".