7428778247 has 8 divisors (see below), whose sum is σ = 8146114320. Its totient is φ = 6718440960.

The previous prime is 7428778241. The next prime is 7428778249.

7428778247 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 7428778247 - 2⁶ = 7428778183 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7428778192 and 7428778201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7428778241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1747472 + ... + 1751717.

It is an arithmetic number, because the mean of its divisors is an integer number (1018264290).

Almost surely, 2^7428778247 is an apocalyptic number.

7428778247 is a deficient number, since it is larger than the sum of its proper divisors (717336073).

7428778247 is a wasteful number, since it uses less digits than its factorization.

7428778247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3499393.

The product of its digits is 9834496, while the sum is 56.

The square root of 7428778247 is about 86190.3605225085. The cubic root of 7428778247 is about 1951.2180202751.

The spelling of 7428778247 in words is "seven billion, four hundred twenty-eight million, seven hundred seventy-eight thousand, two hundred forty-seven".