7285107981 has 8 divisors (see below), whose sum is σ = 9735605440. Its totient is φ = 4845674592.

The previous prime is 7285107979. The next prime is 7285107997. The reversal of 7285107981 is 1897015827.

It is a happy number.

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

It is not a de Polignac number, because 7285107981 - 2¹ = 7285107979 is a prime.

It is a super-2 number, since 2×7285107981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7285107981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7285100981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2764480 + ... + 2767113.

It is an arithmetic number, because the mean of its divisors is an integer number (1216950680).

Almost surely, 2^7285107981 is an apocalyptic number.

It is an amenable number.

7285107981 is a deficient number, since it is larger than the sum of its proper divisors (2450497459).

7285107981 is a wasteful number, since it uses less digits than its factorization.

7285107981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5532035.

The product of its (nonzero) digits is 282240, while the sum is 48.

The square root of 7285107981 is about 85352.8440123702. The cubic root of 7285107981 is about 1938.5573982358.

The spelling of 7285107981 in words is "seven billion, two hundred eighty-five million, one hundred seven thousand, nine hundred eighty-one".