78546661 has 8 divisors (see below), whose sum is σ = 79818048. Its totient is φ = 77280000.

The previous prime is 78546659. The next prime is 78546673. The reversal of 78546661 is 16664587.

It is a happy number.

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 78546661 - 2¹ = 78546659 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 (78547661) 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, 48261 + ... + 49861.

It is an arithmetic number, because the mean of its divisors is an integer number (9977256).

Almost surely, 2^78546661 is an apocalyptic number.

78546661 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

78546661 is the 3964-th centered decagonal number.

It is an amenable number.

78546661 is a deficient number, since it is larger than the sum of its proper divisors (1271387).

78546661 is a wasteful number, since it uses less digits than its factorization.

78546661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2363.

The product of its digits is 241920, while the sum is 43.

The square root of 78546661 is about 8862.6554147163. The cubic root of 78546661 is about 428.2617059730.

The spelling of 78546661 in words is "seventy-eight million, five hundred forty-six thousand, six hundred sixty-one".