78327761 has 4 divisors (see below), whose sum is σ = 78449472. Its totient is φ = 78206052.

The previous prime is 78327701. The next prime is 78327797. The reversal of 78327761 is 16772387.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78327761 - 2²² = 74133457 is a prime.

It is a super-2 number, since 2×78327761² = 12270476286546242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78327701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59885 + ... + 61178.

It is an arithmetic number, because the mean of its divisors is an integer number (19612368).

Almost surely, 2^78327761 is an apocalyptic number.

It is an amenable number.

78327761 is a deficient number, since it is larger than the sum of its proper divisors (121711).

78327761 is a wasteful number, since it uses less digits than its factorization.

78327761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121710.

The product of its digits is 98784, while the sum is 41.

The square root of 78327761 is about 8850.2972266472. The cubic root of 78327761 is about 427.8634980458.

The spelling of 78327761 in words is "seventy-eight million, three hundred twenty-seven thousand, seven hundred sixty-one".