7457823821 has 8 divisors (see below), whose sum is σ = 8684043264. Its totient is φ = 6271808400.

The previous prime is 7457823811. The next prime is 7457823829. The reversal of 7457823821 is 1283287547.

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

It is a cyclic number.

It is not a de Polignac number, because 7457823821 - 2²² = 7453629517 is a prime.

It is a super-2 number, since 2×7457823821² (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 (7457823829) 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 7 ways as a sum of consecutive naturals, for example, 10050605 + ... + 10051346.

It is an arithmetic number, because the mean of its divisors is an integer number (1085505408).

Almost surely, 2^7457823821 is an apocalyptic number.

It is an amenable number.

7457823821 is a deficient number, since it is larger than the sum of its proper divisors (1226219443).

7457823821 is a wasteful number, since it uses less digits than its factorization.

7457823821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20102011.

The product of its digits is 752640, while the sum is 47.

The square root of 7457823821 is about 86358.6927934878. The cubic root of 7457823821 is about 1953.7577175855.

The spelling of 7457823821 in words is "seven billion, four hundred fifty-seven million, eight hundred twenty-three thousand, eight hundred twenty-one".