8781861 has 8 divisors (see below), whose sum is σ = 12773664. Its totient is φ = 5322320.

The previous prime is 8781859. The next prime is 8781863. The reversal of 8781861 is 1681878.

It is an interprime number because it is at equal distance from previous prime (8781859) and next prime (8781863).

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 8781861 - 2¹ = 8781859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8781863) 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, 133026 + ... + 133091.

It is an arithmetic number, because the mean of its divisors is an integer number (1596708).

Almost surely, 2^8781861 is an apocalyptic number.

It is an amenable number.

8781861 is a deficient number, since it is larger than the sum of its proper divisors (3991803).

8781861 is a wasteful number, since it uses less digits than its factorization.

8781861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266131.

The product of its digits is 21504, while the sum is 39.

The square root of 8781861 is about 2963.4204899069. The cubic root of 8781861 is about 206.3140730225.

The spelling of 8781861 in words is "eight million, seven hundred eighty-one thousand, eight hundred sixty-one".