78861001 has 8 divisors (see below), whose sum is σ = 83099520. Its totient is φ = 74631312.

The previous prime is 78860989. The next prime is 78861007. The reversal of 78861001 is 10016887.

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 78861001 - 2⁹ = 78860489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78861007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24576 + ... + 27598.

It is an arithmetic number, because the mean of its divisors is an integer number (10387440).

Almost surely, 2^78861001 is an apocalyptic number.

It is an amenable number.

78861001 is a deficient number, since it is larger than the sum of its proper divisors (4238519).

78861001 is a wasteful number, since it uses less digits than its factorization.

78861001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4415.

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 78861001 is about 8880.3716701498. The cubic root of 78861001 is about 428.8322398887.

Adding to 78861001 its reverse (10016887), we get a palindrome (88877888).

The spelling of 78861001 in words is "seventy-eight million, eight hundred sixty-one thousand, one".