7248785821 has 4 divisors (see below), whose sum is σ = 7250947200. Its totient is φ = 7246624444.

The previous prime is 7248785813. The next prime is 7248785849. The reversal of 7248785821 is 1285878427.

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 7248785821 - 2³ = 7248785813 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 (7248785851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1075651 + ... + 1082368.

It is an arithmetic number, because the mean of its divisors is an integer number (1812736800).

Almost surely, 2^7248785821 is an apocalyptic number.

It is an amenable number.

7248785821 is a deficient number, since it is larger than the sum of its proper divisors (2161379).

7248785821 is a wasteful number, since it uses less digits than its factorization.

7248785821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2161378.

The product of its digits is 2007040, while the sum is 52.

The square root of 7248785821 is about 85139.8016265013. The cubic root of 7248785821 is about 1935.3302697501.

The spelling of 7248785821 in words is "seven billion, two hundred forty-eight million, seven hundred eighty-five thousand, eight hundred twenty-one".