7811000072 has 12 divisors (see below), whose sum is σ = 14646093855. Its totient is φ = 3905375048.

The previous prime is 7811000069. The next prime is 7811000089. The reversal of 7811000072 is 2700001187.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 3905500036 + 3905500036 = 62494^2 + 62494^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=62494.

It is a super-2 number, since 2×7811000072² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 234353 + ... + 265599.

Almost surely, 2^7811000072 is an apocalyptic number.

It is an amenable number.

7811000072 is a deficient number, since it is larger than the sum of its proper divisors (6835093783).

7811000072 is an frugal number, since it uses more digits than its factorization.

7811000072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62500 (or 31249 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 7811000072 is about 88379.8623669442. The cubic root of 7811000072 is about 1984.1243208441.

The spelling of 7811000072 in words is "seven billion, eight hundred eleven million, seventy-two", and thus it is an aban number.