78327931 has 8 divisors (see below), whose sum is σ = 85922928. Its totient is φ = 70812000.

The previous prime is 78327919. The next prime is 78327941. The reversal of 78327931 is 13972387.

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 78327931 - 2¹¹ = 78325883 is a prime.

It is a super-2 number, since 2×78327931² = 12270529549481522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78327901) 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, 17680 + ... + 21661.

It is an arithmetic number, because the mean of its divisors is an integer number (10740366).

Almost surely, 2^78327931 is an apocalyptic number.

78327931 is a deficient number, since it is larger than the sum of its proper divisors (7594997).

78327931 is a wasteful number, since it uses less digits than its factorization.

78327931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39533.

The product of its digits is 63504, while the sum is 40.

The square root of 78327931 is about 8850.3068308393. The cubic root of 78327931 is about 427.8638075858.

The spelling of 78327931 in words is "seventy-eight million, three hundred twenty-seven thousand, nine hundred thirty-one".