78132381 has 8 divisors (see below), whose sum is σ = 105098880. Its totient is φ = 51627072.

The previous prime is 78132371. The next prime is 78132407. The reversal of 78132381 is 18323187.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78132381 - 2⁵ = 78132349 is a prime.

It is a super-2 number, since 2×78132381² = 12209337921458322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78132361) 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, 114901 + ... + 115578.

It is an arithmetic number, because the mean of its divisors is an integer number (13137360).

Almost surely, 2^78132381 is an apocalyptic number.

It is an amenable number.

78132381 is a deficient number, since it is larger than the sum of its proper divisors (26966499).

78132381 is a wasteful number, since it uses less digits than its factorization.

78132381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230595.

The product of its digits is 8064, while the sum is 33.

The square root of 78132381 is about 8839.2522873827. The cubic root of 78132381 is about 427.5074489999.

The spelling of 78132381 in words is "seventy-eight million, one hundred thirty-two thousand, three hundred eighty-one".