78084661 has 12 divisors (see below), whose sum is σ = 82978752. Its totient is φ = 73465704.

The previous prime is 78084647. The next prime is 78084683. The reversal of 78084661 is 16648087.

It is not a de Polignac number, because 78084661 - 2⁷ = 78084533 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 (78084631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58180 + ... + 59506.

It is an arithmetic number, because the mean of its divisors is an integer number (6914896).

Almost surely, 2^78084661 is an apocalyptic number.

It is an amenable number.

78084661 is a deficient number, since it is larger than the sum of its proper divisors (4894091).

78084661 is a wasteful number, since it uses less digits than its factorization.

78084661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528 (or 1509 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 78084661 is about 8836.5525517591. The cubic root of 78084661 is about 427.4203967009.

The spelling of 78084661 in words is "seventy-eight million, eighty-four thousand, six hundred sixty-one".