78672381 has 4 divisors (see below), whose sum is σ = 104896512. Its totient is φ = 52448252.

The previous prime is 78672367. The next prime is 78672383. The reversal of 78672381 is 18327687.

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 78672381 - 2¹⁰ = 78671357 is a prime.

It is a super-2 number, since 2×78672381² = 12378687064418322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78672383) 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, 13112061 + ... + 13112066.

It is an arithmetic number, because the mean of its divisors is an integer number (26224128).

Almost surely, 2^78672381 is an apocalyptic number.

It is an amenable number.

78672381 is a deficient number, since it is larger than the sum of its proper divisors (26224131).

78672381 is a wasteful number, since it uses less digits than its factorization.

78672381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26224130.

The product of its digits is 112896, while the sum is 42.

The square root of 78672381 is about 8869.7452612801. The cubic root of 78672381 is about 428.4900728271.

The spelling of 78672381 in words is "seventy-eight million, six hundred seventy-two thousand, three hundred eighty-one".