7148728399 has 4 divisors (see below), whose sum is σ = 7229051280. Its totient is φ = 7068405520.

The previous prime is 7148728393. The next prime is 7148728421. The reversal of 7148728399 is 9938278417.

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-7148728399 is a prime.

It is a super-2 number, since 2×7148728399² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7148728393) 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, 40161307 + ... + 40161484.

It is an arithmetic number, because the mean of its divisors is an integer number (1807262820).

Almost surely, 2^7148728399 is an apocalyptic number.

7148728399 is a deficient number, since it is larger than the sum of its proper divisors (80322881).

7148728399 is an equidigital number, since it uses as much as digits as its factorization.

7148728399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80322880.

The product of its digits is 6096384, while the sum is 58.

The square root of 7148728399 is about 84550.1531577560. The cubic root of 7148728399 is about 1926.3843103055.

The spelling of 7148728399 in words is "seven billion, one hundred forty-eight million, seven hundred twenty-eight thousand, three hundred ninety-nine".