7816820423 has 4 divisors (see below), whose sum is σ = 7850955240. Its totient is φ = 7782685608.

The previous prime is 7816820359. The next prime is 7816820447. The reversal of 7816820423 is 3240286187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3240286187 = 113 ⋅28675099.

It is a cyclic number.

It is not a de Polignac number, because 7816820423 - 2⁶ = 7816820359 is a prime.

It is a super-2 number, since 2×7816820423² (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 (7816822423) 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, 17067065 + ... + 17067522.

It is an arithmetic number, because the mean of its divisors is an integer number (1962738810).

Almost surely, 2^7816820423 is an apocalyptic number.

7816820423 is a deficient number, since it is larger than the sum of its proper divisors (34134817).

7816820423 is a wasteful number, since it uses less digits than its factorization.

7816820423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34134816.

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 7816820423 is about 88412.7842735427. The cubic root of 7816820423 is about 1984.6170205692.

The spelling of 7816820423 in words is "seven billion, eight hundred sixteen million, eight hundred twenty thousand, four hundred twenty-three".