7821428003 has 4 divisors (see below), whose sum is σ = 7831955568. Its totient is φ = 7810900440.

The previous prime is 7821427997. The next prime is 7821428009. The reversal of 7821428003 is 3008241287.

7821428003 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.

It is an interprime number because it is at equal distance from previous prime (7821427997) and next prime (7821428009).

It is a cyclic number.

It is not a de Polignac number, because 7821428003 - 2⁴ = 7821427987 is a prime.

It is a super-2 number, since 2×7821428003² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7821428009) 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, 5262668 + ... + 5264153.

It is an arithmetic number, because the mean of its divisors is an integer number (1957988892).

Almost surely, 2^7821428003 is an apocalyptic number.

7821428003 is a deficient number, since it is larger than the sum of its proper divisors (10527565).

7821428003 is a wasteful number, since it uses less digits than its factorization.

7821428003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10527564.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 7821428003 is about 88438.8376393539. The cubic root of 7821428003 is about 1985.0068843546.

The spelling of 7821428003 in words is "seven billion, eight hundred twenty-one million, four hundred twenty-eight thousand, three".