7287157861 has 8 divisors (see below), whose sum is σ = 7311096000. Its totient is φ = 7263260160.

The previous prime is 7287157849. The next prime is 7287157901. The reversal of 7287157861 is 1687517827.

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

It is a cyclic number.

It is not a de Polignac number, because 7287157861 - 2¹³ = 7287149669 is a prime.

It is a super-2 number, since 2×7287157861² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7287157799 and 7287157808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7287157061) 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, 374470 + ... + 393448.

It is an arithmetic number, because the mean of its divisors is an integer number (913887000).

Almost surely, 2^7287157861 is an apocalyptic number.

It is an amenable number.

7287157861 is a deficient number, since it is larger than the sum of its proper divisors (23938139).

7287157861 is a wasteful number, since it uses less digits than its factorization.

7287157861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20219.

The product of its digits is 1317120, while the sum is 52.

The square root of 7287157861 is about 85364.8514378137. The cubic root of 7287157861 is about 1938.7392046182.

The spelling of 7287157861 in words is "seven billion, two hundred eighty-seven million, one hundred fifty-seven thousand, eight hundred sixty-one".