78332381 has 4 divisors (see below), whose sum is σ = 80859264. Its totient is φ = 75805500.

The previous prime is 78332377. The next prime is 78332389. The reversal of 78332381 is 18323387.

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 78332381 - 2² = 78332377 is a prime.

It is a super-2 number, since 2×78332381² = 12271923826258322, which contains 22 as substring.

It is a Duffinian 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 (78332389) 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, 1263395 + ... + 1263456.

It is an arithmetic number, because the mean of its divisors is an integer number (20214816).

Almost surely, 2^78332381 is an apocalyptic number.

It is an amenable number.

78332381 is a deficient number, since it is larger than the sum of its proper divisors (2526883).

78332381 is a wasteful number, since it uses less digits than its factorization.

78332381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2526882.

The product of its digits is 24192, while the sum is 35.

The square root of 78332381 is about 8850.5582309818. The cubic root of 78332381 is about 427.8719100931.

The spelling of 78332381 in words is "seventy-eight million, three hundred thirty-two thousand, three hundred eighty-one".