84780917 has 8 divisors (see below), whose sum is σ = 91386624. Its totient is φ = 78187248.

The previous prime is 84780901. The next prime is 84780919. The reversal of 84780917 is 71908748.

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 84780917 - 2⁴ = 84780901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84780919) 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, 16208 + ... + 20790.

It is an arithmetic number, because the mean of its divisors is an integer number (11423328).

Almost surely, 2^84780917 is an apocalyptic number.

It is an amenable number.

84780917 is a deficient number, since it is larger than the sum of its proper divisors (6605707).

84780917 is a wasteful number, since it uses less digits than its factorization.

84780917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6019.

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 84780917 is about 9207.6553475899. The cubic root of 84780917 is about 439.3048890138.

The spelling of 84780917 in words is "eighty-four million, seven hundred eighty thousand, nine hundred seventeen".