7811947045 has 16 divisors (see below), whose sum is σ = 10756222848. Its totient is φ = 5335416000.

The previous prime is 7811947043. The next prime is 7811947067. The reversal of 7811947045 is 5407491187.

It is a happy number.

It is not a de Polignac number, because 7811947045 - 2¹ = 7811947043 is a prime.

It is a super-2 number, since 2×7811947045² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7811946986 and 7811947004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7811947043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 435834 + ... + 453403.

It is an arithmetic number, because the mean of its divisors is an integer number (672263928).

Almost surely, 2^7811947045 is an apocalyptic number.

It is an amenable number.

7811947045 is a deficient number, since it is larger than the sum of its proper divisors (2944275803).

7811947045 is a wasteful number, since it uses less digits than its factorization.

7811947045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 889500.

The product of its (nonzero) digits is 282240, while the sum is 46.

The square root of 7811947045 is about 88385.2196071266. The cubic root of 7811947045 is about 1984.2044999171.

The spelling of 7811947045 in words is "seven billion, eight hundred eleven million, nine hundred forty-seven thousand, forty-five".