7900025781 has 16 divisors (see below), whose sum is σ = 10599452864. Its totient is φ = 5233745664.

The previous prime is 7900025779. The next prime is 7900025801. The reversal of 7900025781 is 1875200097.

It is not a de Polignac number, because 7900025781 - 2¹ = 7900025779 is a prime.

It is a super-2 number, since 2×7900025781² (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 (7900025761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 297651 + ... + 323103.

It is an arithmetic number, because the mean of its divisors is an integer number (662465804).

Almost surely, 2^7900025781 is an apocalyptic number.

It is an amenable number.

7900025781 is a deficient number, since it is larger than the sum of its proper divisors (2699427083).

7900025781 is a wasteful number, since it uses less digits than its factorization.

7900025781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26100.

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 7900025781 is about 88882.0892024934. The cubic root of 7900025781 is about 1991.6338677963.

The spelling of 7900025781 in words is "seven billion, nine hundred million, twenty-five thousand, seven hundred eighty-one".